diff --git a/etcs/hostapd/hostapd.conf b/etcs/hostapd/hostapd/hostapd.conf
similarity index 81%
rename from etcs/hostapd/hostapd.conf
rename to etcs/hostapd/hostapd/hostapd.conf
index 07bd7dd..81b6bf7 100644
--- a/etcs/hostapd/hostapd.conf
+++ b/etcs/hostapd/hostapd/hostapd.conf
@@ -6,4 +6,4 @@ wpa_key_mgmt=WPA-PSK
 wpa_pairwise=TKIP
 rsn_pairwise=CCMP
 ssid=TeraHz
-wpa_passphrase=terahertz
+wpa_passphrase=teraherc
diff --git a/etcs/hostapd/hostapd/ifupdown.sh b/etcs/hostapd/hostapd/ifupdown.sh
new file mode 100644
index 0000000..c5d2357
--- /dev/null
+++ b/etcs/hostapd/hostapd/ifupdown.sh
@@ -0,0 +1,146 @@
+#!/bin/sh
+
+# Copyright (C) 2006-2009 Debian hostapd maintainers 
+# 	Faidon Liambotis <paravoid@debian.org>
+#	Kel Modderman <kel@otaku42.de>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# On Debian GNU/Linux systems, the text of the GPL license,
+# version 2, can be found in /usr/share/common-licenses/GPL-2.
+
+# quit if we're called for lo
+if [ "$IFACE" = lo ]; then
+	exit 0
+fi
+
+if [ -n "$IF_HOSTAPD" ]; then
+	HOSTAPD_CONF="$IF_HOSTAPD"
+else
+	exit 0
+fi
+
+HOSTAPD_BIN="/usr/sbin/hostapd"
+HOSTAPD_PNAME="hostapd"
+HOSTAPD_PIDFILE="/run/hostapd.$IFACE.pid"
+HOSTAPD_OMIT_PIDFILE="/run/sendsigs.omit.d/hostapd.$IFACE.pid"
+
+if [ ! -x "$HOSTAPD_BIN" ]; then
+	exit 0
+fi
+
+if [ "$VERBOSITY" = "1" ]; then
+	TO_NULL="/dev/stdout"
+else
+	TO_NULL="/dev/null"
+fi
+
+hostapd_msg () {
+	case "$1" in
+		verbose)
+			shift
+			echo "$HOSTAPD_PNAME: $@" > "$TO_NULL"
+			;;
+		stderr)
+			shift
+			echo "$HOSTAPD_PNAME: $@" > /dev/stderr
+			;;
+		*)
+			;;
+	esac
+}
+
+test_hostapd_pidfile () {
+	if [ -n "$1" ] && [ -f "$2" ]; then
+		if start-stop-daemon --stop --quiet --signal 0 \
+			--exec "$1" --pidfile "$2"; then
+			return 0
+		else
+			rm -f "$2"
+			return 1
+		fi
+	else
+		return 1
+	fi
+}
+
+init_hostapd () {
+	HOSTAPD_OPTIONS="-B -P $HOSTAPD_PIDFILE $HOSTAPD_CONF"
+	HOSTAPD_MESSAGE="$HOSTAPD_BIN $HOSTAPD_OPTIONS"
+	
+	test_hostapd_pidfile "$HOSTAPD_BIN" "$HOSTAPD_PIDFILE" && return 0
+
+	hostapd_msg verbose "$HOSTAPD_MESSAGE"
+	start-stop-daemon --start --oknodo --quiet --exec "$HOSTAPD_BIN" \
+		--pidfile "$HOSTAPD_PIDFILE" -- $HOSTAPD_OPTIONS > "$TO_NULL"
+
+	if [ "$?" -ne 0 ]; then
+		return "$?"
+	fi
+
+	HOSTAPD_PIDFILE_WAIT=0
+	until [ -s "$HOSTAPD_PIDFILE" ]; do
+		if [ "$HOSTAPD_PIDFILE_WAIT" -ge 5 ]; then
+			hostapd_msg stderr \
+				"timeout waiting for pid file creation"
+			return 1
+		fi
+
+		HOSTAPD_PIDFILE_WAIT=$(($HOSTAPD_PIDFILE_WAIT + 1))
+		sleep 1
+	done
+	cat "$HOSTAPD_PIDFILE" > "$HOSTAPD_OMIT_PIDFILE"
+
+	return 0
+}
+
+kill_hostapd () {
+	HOSTAPD_MESSAGE="stopping $HOSTAPD_PNAME via pidfile: $HOSTAPD_PIDFILE"
+
+	test_hostapd_pidfile "$HOSTAPD_BIN" "$HOSTAPD_PIDFILE" || return 0
+	
+	hostapd_msg verbose "$HOSTAPD_MESSAGE"
+	start-stop-daemon --stop --oknodo --quiet --exec "$HOSTAPD_BIN" \
+		--pidfile "$HOSTAPD_PIDFILE" > "$TO_NULL"
+	
+	[ "$HOSTAPD_OMIT_PIDFILE" ] && rm -f "$HOSTAPD_OMIT_PIDFILE"
+}
+
+case "$MODE" in 
+	start)
+		case "$PHASE" in
+			pre-up)
+				init_hostapd || exit 1
+				;;
+			*)
+				hostapd_msg stderr "unknown phase: \"$PHASE\""
+				exit 1
+				;;
+		esac
+		;;
+	stop)
+		case "$PHASE" in
+			post-down)
+				kill_hostapd
+				;;
+			*)
+				hostapd_msg stderr "unknown phase: \"$PHASE\""
+				exit 1
+				;;
+		esac
+		;;
+	*)
+		hostapd_msg stderr "unknown mode: \"$MODE\""
+		exit 1
+		;;
+esac
+
+exit 0
diff --git a/etcs/hostapd/lighttpd/conf-available/05-auth.conf b/etcs/hostapd/lighttpd/conf-available/05-auth.conf
new file mode 100644
index 0000000..6c14e47
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/05-auth.conf
@@ -0,0 +1,25 @@
+# /usr/share/doc/lighttpd/authentication.txt.gz
+
+server.modules                += ( "mod_auth" )
+
+# auth.backend                 = "plain"
+# auth.backend.plain.userfile  = "lighttpd.user"
+# auth.backend.plain.groupfile = "lighttpd.group"
+
+# auth.backend.ldap.hostname   = "localhost"
+# auth.backend.ldap.base-dn    = "dc=my-domain,dc=com"
+# auth.backend.ldap.filter     = "(uid=$)"
+
+# auth.require                 = ( "/server-status" => 
+#                                ( 
+#				  "method"  => "digest",
+#				  "realm"   => "download archiv",
+#				  "require" => "group=www|user=jan|host=192.168.2.10"
+#				),
+#				"/server-info" => 
+#                                ( 
+#				  "method"  => "digest",
+#				  "realm"   => "download archiv",
+#				  "require" => "group=www|user=jan|host=192.168.2.10"
+#				)
+#                              )
diff --git a/etcs/hostapd/lighttpd/conf-available/10-accesslog.conf b/etcs/hostapd/lighttpd/conf-available/10-accesslog.conf
new file mode 100644
index 0000000..552a762
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-accesslog.conf
@@ -0,0 +1,3 @@
+server.modules += ( "mod_accesslog" )
+
+accesslog.filename = "/var/log/lighttpd/access.log"
diff --git a/etcs/hostapd/lighttpd/conf-available/10-cgi.conf b/etcs/hostapd/lighttpd/conf-available/10-cgi.conf
new file mode 100644
index 0000000..1e93a11
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-cgi.conf
@@ -0,0 +1,15 @@
+# /usr/share/doc/lighttpd/cgi.txt
+
+server.modules += ( "mod_cgi" )
+
+$HTTP["url"] =~ "^/cgi-bin/" {
+	cgi.assign = ( "" => "" )
+}
+
+## Warning this represents a security risk, as it allow to execute any file
+## with a .pl/.py even outside of /usr/lib/cgi-bin.
+#
+#cgi.assign      = (
+#	".pl"  => "/usr/bin/perl",
+#	".py"  => "/usr/bin/python",
+#)
diff --git a/etcs/hostapd/lighttpd/conf-available/10-dir-listing.conf b/etcs/hostapd/lighttpd/conf-available/10-dir-listing.conf
new file mode 100644
index 0000000..10e32e8
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-dir-listing.conf
@@ -0,0 +1,2 @@
+dir-listing.encoding = "utf-8"
+server.dir-listing   = "enable"
diff --git a/etcs/hostapd/lighttpd/conf-available/10-evasive.conf b/etcs/hostapd/lighttpd/conf-available/10-evasive.conf
new file mode 100644
index 0000000..6c61733
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-evasive.conf
@@ -0,0 +1 @@
+server.modules += ( "mod_evasive" )
diff --git a/etcs/hostapd/lighttpd/conf-available/10-evhost.conf b/etcs/hostapd/lighttpd/conf-available/10-evhost.conf
new file mode 100644
index 0000000..2c33448
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-evhost.conf
@@ -0,0 +1,5 @@
+# http://redmine.lighttpd.net/wiki/1/Docs:ModEVhost
+
+server.modules += ( "mod_evhost" )
+
+evhost.path-pattern = "/srv/%_/htdocs"
diff --git a/etcs/hostapd/lighttpd/conf-available/10-expire.conf b/etcs/hostapd/lighttpd/conf-available/10-expire.conf
new file mode 100644
index 0000000..634236a
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-expire.conf
@@ -0,0 +1,3 @@
+# http://redmine.lighttpd.net/projects/lighttpd/wiki/Docs:ModExpire
+
+server.modules += ( "mod_expire" )
diff --git a/etcs/hostapd/lighttpd/conf-available/10-fastcgi.conf b/etcs/hostapd/lighttpd/conf-available/10-fastcgi.conf
new file mode 100644
index 0000000..7862ed9
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-fastcgi.conf
@@ -0,0 +1,4 @@
+# /usr/share/doc/lighttpd/fastcgi.txt.gz
+# http://redmine.lighttpd.net/projects/lighttpd/wiki/Docs:ConfigurationOptions#mod_fastcgi-fastcgi
+
+server.modules += ( "mod_fastcgi" )
diff --git a/etcs/hostapd/lighttpd/conf-available/10-flv-streaming.conf b/etcs/hostapd/lighttpd/conf-available/10-flv-streaming.conf
new file mode 100644
index 0000000..d8317c0
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-flv-streaming.conf
@@ -0,0 +1 @@
+server.modules += ( "mod_flv_streaming" )
diff --git a/etcs/hostapd/lighttpd/conf-available/10-no-www.conf b/etcs/hostapd/lighttpd/conf-available/10-no-www.conf
new file mode 100644
index 0000000..09b163c
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-no-www.conf
@@ -0,0 +1,3 @@
+$HTTP["host"] =~ "^www\.(.*)" {
+  url.redirect = ( "^/(.*)" => "http://%1/$1" )
+}
diff --git a/etcs/hostapd/lighttpd/conf-available/10-proxy.conf b/etcs/hostapd/lighttpd/conf-available/10-proxy.conf
new file mode 100644
index 0000000..1e95945
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-proxy.conf
@@ -0,0 +1,25 @@
+# /usr/share/doc/lighttpd/proxy.txt
+
+server.modules   += ( "mod_proxy" )
+
+## Balance algorithm, possible values are: "hash", "round-robin" or "fair" (default)
+# proxy.balance     = "hash" 
+
+
+## Redirect all queries to files ending with ".php" to 192.168.0.101:80 
+#proxy.server     = ( ".php" =>
+#                     ( 
+#                       ( "host" => "192.168.0.101",
+#                         "port" => 80
+#                       )
+#                     )
+#                    )
+
+## Redirect all connections on www.example.com to 10.0.0.1{0,1,2,3}
+#$HTTP["host"] == "www.example.com" {
+#  proxy.balance = "hash"
+#  proxy.server  = ( "" => ( ( "host" => "10.0.0.10" ),
+#                            ( "host" => "10.0.0.11" ),
+#                            ( "host" => "10.0.0.12" ),
+#                            ( "host" => "10.0.0.13" ) ) )
+#}
diff --git a/etcs/hostapd/lighttpd/conf-available/10-rewrite.conf b/etcs/hostapd/lighttpd/conf-available/10-rewrite.conf
new file mode 100644
index 0000000..f82fc1a
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-rewrite.conf
@@ -0,0 +1,4 @@
+# /usr/share/doc/lighttpd/rewrite.txt
+# http://redmine.lighttpd.net/projects/lighttpd/wiki/Docs_ConfigurationOptions#mod_rewrite-rewriting
+
+server.modules += ( "mod_rewrite" )
diff --git a/etcs/hostapd/lighttpd/conf-available/10-rrdtool.conf b/etcs/hostapd/lighttpd/conf-available/10-rrdtool.conf
new file mode 100644
index 0000000..0a49c98
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-rrdtool.conf
@@ -0,0 +1,10 @@
+# /usr/share/doc/lighttpd/rrdtool.txt
+
+server.modules += ( "mod_rrdtool" )
+
+## path to the rrdtool binary
+rrdtool.binary   = "/usr/bin/rrdtool"
+
+## file to store the rrd database, will be created by lighttpd
+rrdtool.db-name   = "/var/www/lighttpd.rrd"
+
diff --git a/etcs/hostapd/lighttpd/conf-available/10-simple-vhost.conf b/etcs/hostapd/lighttpd/conf-available/10-simple-vhost.conf
new file mode 100644
index 0000000..7dfa1ca
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-simple-vhost.conf
@@ -0,0 +1,11 @@
+# /usr/share/doc/lighttpd/simple-vhost.txt
+
+server.modules += ( "mod_simple_vhost" )
+
+## The document root of a virtual host is document-root =
+##   simple-vhost.server-root + $HTTP["host"] + simple-vhost.document-root
+simple-vhost.server-root         = "/srv"
+simple-vhost.document-root       = "htdocs"
+
+## the default host if no host is sent
+simple-vhost.default-host        = "www.example.com"
diff --git a/etcs/hostapd/lighttpd/conf-available/10-ssi.conf b/etcs/hostapd/lighttpd/conf-available/10-ssi.conf
new file mode 100644
index 0000000..55d2aba
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-ssi.conf
@@ -0,0 +1,5 @@
+# /usr/share/doc/lighttpd/ssi.txt
+
+server.modules += ( "mod_ssi" )
+
+ssi.extension   = ( ".shtml" )
diff --git a/etcs/hostapd/lighttpd/conf-available/10-ssl.conf b/etcs/hostapd/lighttpd/conf-available/10-ssl.conf
new file mode 100644
index 0000000..6bb602a
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-ssl.conf
@@ -0,0 +1,9 @@
+# /usr/share/doc/lighttpd/ssl.txt
+
+$SERVER["socket"] == "0.0.0.0:443" {
+	ssl.engine  = "enable"
+	ssl.pemfile = "/etc/lighttpd/server.pem"
+
+	ssl.cipher-list = "ECDHE-RSA-AES256-SHA384:AES256-SHA256:RC4:HIGH:!MD5:!aNULL:!EDH:!AESGCM"
+	ssl.honor-cipher-order = "enable"
+}
diff --git a/etcs/hostapd/lighttpd/conf-available/10-status.conf b/etcs/hostapd/lighttpd/conf-available/10-status.conf
new file mode 100644
index 0000000..2859372
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-status.conf
@@ -0,0 +1,15 @@
+# /usr/share/doc/lighttpd/status.txt
+# http://trac.lighttpd.net/trac/wiki/Docs%3AModStatus
+
+server.modules += ( "mod_status" )
+
+# status.status-url = "/server-status"
+
+# status.config-url = "/server-config"
+
+## relative URL for a plain-text page containing the internal statistics
+# status.statistics-url = "/server-statistics"
+
+## add JavaScript which allows client-side sorting for the connection overview
+## default: enable
+# status.enable-sort = "disable"
diff --git a/etcs/hostapd/lighttpd/conf-available/10-userdir.conf b/etcs/hostapd/lighttpd/conf-available/10-userdir.conf
new file mode 100644
index 0000000..3507eaf
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-userdir.conf
@@ -0,0 +1,13 @@
+## The userdir module provides a simple way to link user-based directories into
+## the global namespace of the webserver.
+##
+# /usr/share/doc/lighttpd/userdir.txt
+
+server.modules      += ( "mod_userdir" )
+
+## the subdirectory of a user's home dir which should be accessible
+## under http://$host/~$user
+userdir.path         = "public_html"
+
+## The users whose home directories should not be accessible
+userdir.exclude-user = ( "root", "postmaster" )
diff --git a/etcs/hostapd/lighttpd/conf-available/10-usertrack.conf b/etcs/hostapd/lighttpd/conf-available/10-usertrack.conf
new file mode 100644
index 0000000..018b5f4
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/10-usertrack.conf
@@ -0,0 +1 @@
+server.modules += ( "mod_usertrack" )
diff --git a/etcs/hostapd/lighttpd/conf-available/11-extforward.conf b/etcs/hostapd/lighttpd/conf-available/11-extforward.conf
new file mode 100644
index 0000000..cf06e82
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/11-extforward.conf
@@ -0,0 +1,6 @@
+# -*- depends: accesslog -*-
+
+server.modules += ( "mod_extforward" )
+
+# extforward.headers = ("X-Cluster-Client-Ip")
+# extforward.forwarder = ("10.0.0.232" => "trust")
diff --git a/etcs/hostapd/lighttpd/conf-available/15-fastcgi-php.conf b/etcs/hostapd/lighttpd/conf-available/15-fastcgi-php.conf
new file mode 100644
index 0000000..cea11c2
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/15-fastcgi-php.conf
@@ -0,0 +1,20 @@
+# -*- depends: fastcgi -*-
+# /usr/share/doc/lighttpd/fastcgi.txt.gz
+# http://redmine.lighttpd.net/projects/lighttpd/wiki/Docs:ConfigurationOptions#mod_fastcgi-fastcgi
+
+## Start an FastCGI server for php (needs the php5-cgi package)
+fastcgi.server += ( ".php" => 
+	((
+		"bin-path" => "/usr/bin/php-cgi",
+		"socket" => "/var/run/lighttpd/php.socket",
+		"max-procs" => 1,
+		"bin-environment" => ( 
+			"PHP_FCGI_CHILDREN" => "4",
+			"PHP_FCGI_MAX_REQUESTS" => "10000"
+		),
+		"bin-copy-environment" => (
+			"PATH", "SHELL", "USER"
+		),
+		"broken-scriptfilename" => "enable"
+	))
+)
diff --git a/etcs/hostapd/lighttpd/conf-available/90-debian-doc.conf b/etcs/hostapd/lighttpd/conf-available/90-debian-doc.conf
new file mode 100644
index 0000000..0eb4cc2
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/90-debian-doc.conf
@@ -0,0 +1,15 @@
+#### handle Debian Policy Manual, Section 11.5. urls
+## by default allow them only from localhost
+$HTTP["remoteip"] =~ "^127\.0\.0\.1$|^::1$" {
+        alias.url += (
+		"/cgi-bin/" => "/usr/lib/cgi-bin/",
+                "/doc/" => "/usr/share/doc/",
+                "/images/" => "/usr/share/images/"
+        )
+        $HTTP["url"] =~ "^/doc/|^/images/" {
+                dir-listing.activate = "enable"
+        }
+        $HTTP["url"] =~ "^/cgi-bin/" {
+                cgi.assign = ( "" => "" )
+        }
+}
diff --git a/etcs/hostapd/lighttpd/conf-available/90-javascript-alias.conf b/etcs/hostapd/lighttpd/conf-available/90-javascript-alias.conf
new file mode 100644
index 0000000..a8b442f
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/90-javascript-alias.conf
@@ -0,0 +1 @@
+alias.url += ("/javascript" => "/usr/share/javascript")
diff --git a/etcs/hostapd/lighttpd/conf-available/README b/etcs/hostapd/lighttpd/conf-available/README
new file mode 100644
index 0000000..08679f7
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-available/README
@@ -0,0 +1,22 @@
+ligghttpd Configuration under Debian GNU/Linux
+==============================================
+
+Files and Directories in /etc/lighttpd:
+---------------------------------------
+
+lighttpd.conf:
+	 main configuration file
+
+conf-available/
+	This directory contains a series of .conf files. These files contain
+        configuration directives necessary to load and run webserver modules.
+	If you want to create your own files they names should be
+        build as nn-name.conf where "nn" is two digit number (number
+	is used to find order for loading files)
+
+conf-enabled/	  
+	To actually enable a module for lighttpd, it is necessary to create a 
+        symlink in this directory to the .conf file in conf-available/.
+
+Enabling and disabling modules could be done by provided
+/usr/sbin/lighty-enable-mod and /usr/sbin/lighty-disable-mod scripts. 
diff --git a/etcs/hostapd/lighttpd/conf-enabled/90-javascript-alias.conf b/etcs/hostapd/lighttpd/conf-enabled/90-javascript-alias.conf
new file mode 120000
index 0000000..dc909f6
--- /dev/null
+++ b/etcs/hostapd/lighttpd/conf-enabled/90-javascript-alias.conf
@@ -0,0 +1 @@
+../conf-available/90-javascript-alias.conf
\ No newline at end of file
diff --git a/etcs/hostapd/lighttpd/lighttpd.conf b/etcs/hostapd/lighttpd/lighttpd.conf
new file mode 100644
index 0000000..6e848cf
--- /dev/null
+++ b/etcs/hostapd/lighttpd/lighttpd.conf
@@ -0,0 +1,27 @@
+server.modules = (
+	"mod_access",
+	"mod_alias",
+	"mod_compress",
+ 	"mod_redirect",
+)
+
+server.document-root        = "/home/terahz/TeraHz/frontend"
+server.upload-dirs          = ( "/var/cache/lighttpd/uploads" )
+server.errorlog             = "/var/log/lighttpd/error.log"
+server.pid-file             = "/var/run/lighttpd.pid"
+server.username             = "www-data"
+server.groupname            = "www-data"
+server.port                 = 80
+
+
+index-file.names            = ( "index.php", "index.html", "index.lighttpd.html" )
+url.access-deny             = ( "~", ".inc" )
+static-file.exclude-extensions = ( ".php", ".pl", ".fcgi" )
+
+compress.cache-dir          = "/var/cache/lighttpd/compress/"
+compress.filetype           = ( "application/javascript", "text/css", "text/html", "text/plain" )
+
+# default listening port for IPv6 falls back to the IPv4 port
+include_shell "/usr/share/lighttpd/use-ipv6.pl " + server.port
+include_shell "/usr/share/lighttpd/create-mime.assign.pl"
+include_shell "/usr/share/lighttpd/include-conf-enabled.pl"