 YLT
^b0t$
^bluefish 
^Calypso v\/
^Corax
^COMODO DCV
^DangDang
^DavClnt
^DHSH
^Expanse
^FDM 
^git\/
^Goose\/
^Grabber
^HTTPClient\/
^HTTPing
^Java\/
^Jeode\/
^Jetty\/
^Mail\/
^Mget
^Microsoft URL Control
^Mikrotik\/
^Netlab360
^NG\/[0-9\.]
^NING\/
^Nuclei
^PHP\/
^RMA\/
^Ruby|Ruby\/[0-9]
^Swurl 
^TLS tester 
^ureq
^VSE\/[0-9]
^WordPress\.com
^XRL\/[0-9]
^ZmEu
008\/
13TABS
192\.comAgent
2GDPR\/
2ip\.ru
404enemy
7Siters
80legs
a\.pr-cy\.ru
a3logics\.in
A6-Indexer
Abonti
Aboundex
aboutthedomain
Accoona-AI-Agent
acebookexternalhit\/
acoon
acrylicapps\.com\/pulp
Acunetix
AdAuth\/
adbeat
AddThis
ADmantX
AdminLabs
adressendeutschland
adreview\/
adscanner
Adstxtaggregator
adstxt-worker
adstxt\.com
AffiliateLabz\/
agentslug
AHC
aihit
aiohttp\/
Airmail
akka-http\/
akula\/
alertra
alexa site audit
Alibaba\.Security\.Heimdall
Alligator
allloadin
AllSubmitter
alyze\.info
amagit
^Amazon Simple Notification Service Agent$
Anarchie
AndroidDownloadManager
Anemone
AngleSharp
annotate_google
Anthill
Ant\.com
Anturis Agent
AnyEvent-HTTP\/
Apache Droid
Apache OpenOffice
Apache-HttpAsyncClient
Apache-HttpClient
ApacheBench
Apexoo
apimon\.de
APIs-Google
AportWorm\/
AppBeat\/
AppEngine-Google
AppleSyndication
Aprc\/[0-9]
Arachmo
arachnode
Arachnophilia
aria2
Arukereso
asafaweb
Asana\/
AskQuickly
Ask Jeeves
ASPSeek
Asterias
Astute
asynchttp
Attach
attohttpc
autocite
AutomaticWPTester
Autonomy
axios\/
AWS Security Scanner
B-l-i-t-z-B-O-T
Backlink-Ceck
backlink-check
BacklinkHttpStatus
BackStreet
BackupLand
BackWeb
Bad-Neighborhood
Badass
baidu\.com
Bandit
basicstate
BatchFTP
Battleztar Bazinga
baypup\/
BazQux
BBBike
BCKLINKS
BDFetch
BegunAdvertising
Bewica-security-scan
Bidtellect
BigBozz
Bigfoot
biglotron
BingLocalSearch
BingPreview
binlar
biNu image cacher
Bitacle
Bitrix link preview
biz_Directory
BKCTwitterUnshortener\/
Black Hole
Blackboard Safeassign
BlackWidow
BlockNote\.Net
BlogBridge
Bloglines
Bloglovin
BlogPulseLive
BlogSearch
Blogtrottr
BlowFish
boitho\.com-dc
Boost\.Beast
BPImageWalker
Braintree-Webhooks
Branch Metrics API
Branch-Passthrough
Brandprotect
BrandVerity
Brandwatch
Brodie\/
Browsershots
BUbiNG
Buck\/
Buddy
BuiltWith
Bullseye
BunnySlippers
Burf Search
Butterfly\/
BuzzSumo
CAAM\/[0-9]
CakePHP
Calculon
Canary%20Mail
CaretNail
catexplorador
CC Metadata Scaper
Cegbfeieh
censys
centuryb.o.t9[at]gmail.com
Cerberian Drtrs
CERT\.at-Statistics-Survey
cf-facebook
cg-eye
changedetection
ChangesMeter
Charlotte
CheckHost
checkprivacy
CherryPicker
ChinaClaw
Chirp\/
chkme\.com
Chlooe
Chromaxa
CirrusExplorer
CISPA Web Analyser
CISPA Vulnerability Notification
Citoid
CJNetworkQuality
Clarsentia
clips\.ua\.ac\.be
Cloud mapping
CloudEndure
CloudFlare-AlwaysOnline
Cloudflare-Healthchecks
Cloudinary
cmcm\.com
coccoc
cognitiveseo
colly -
CommaFeed
Commons-HttpClient
commonscan
contactbigdatafr
contentkingapp
Contextual Code Sites Explorer
convera
CookieReports
copyright sheriff
CopyRightCheck
Copyscape
cortex\/
Cosmos4j\.feedback
Covario-IDS
Craw\/
Crescent
Crowsnest
Criteo
CSHttp
CSSCheck
Cula\/
curb
Curious George
curl
cuwhois\/
cybo\.com
DAP\/NetHTTP
DareBoost
DatabaseDriverMysqli
DataCha0s
Datafeedwatch
Datanyze
DataparkSearch
dataprovider
DataXu
Daum(oa)?[ \/][0-9]
dBpoweramp
ddline
deeris
delve\.ai
Demon
DeuSu
developers\.google\.com\/\+\/web\/snippet\/
Devil
Digg
Digincore
DigitalPebble
Dirbuster
Discourse Forum Onebox
Disqus\/
Dispatch\/
DittoSpyder
dlvr
DMBrowser
DNSPod-reporting
docoloc
Dolphin http client
DomainAppender
DomainLabz
Domains Project\/
Donuts Content Explorer
dotMailer content retrieval
dotSemantic
downforeveryoneorjustme
Download Wonder
downnotifier
DowntimeDetector
Drip
drupact
Drupal \(\+http:\/\/drupal\.org\/\)
DTS Agent
dubaiindex
DuplexWeb-Google
DynatraceSynthetic
EARTHCOM
Easy-Thumb
EasyDL
Ebingbong
ec2linkfinder
eCairn-Grabber
eCatch
ECCP
eContext\/
Ecxi
EirGrabber
ElectricMonk
elefent
EMail Exractor
EMail Wolf
EmailWolf
Embarcadero
Embed PHP Library
Embedly
endo\/
europarchive\.org
evc-batch
EventMachine HttpClient
Everwall Link Expander
Evidon
Evrinid
ExactSearch
ExaleadCloudview
Excel\/
exif
ExoRank
Exploratodo
Express WebPictures
Extreme Picture Finder
EyeNetIE
ezooms
facebookexternalhit
facebookexternalua
facebookplatform
fairshare
Faraday v
fasthttp
Faveeo
Favicon downloader
faviconkit
faviconarchive
FavOrg
Feed Wrangler
Feedable\/
Feedbin
FeedBooster
FeedBucket
FeedBunch\/
FeedBurner
feeder
Feedly
Feedshow\/
FeedshowOnline
Feedspot
FeedViewer\/
Feedwind\/
FeedZcollector
feeltiptop
Fetch API
Fetch\/[0-9]
Fever\/[0-9]
FHscan
Fiery%20Feeds
Filestack
Fimap
findlink
findthatfile
FlashGet
FlipboardBrowserProxy
FlipboardProxy
FlipboardRSS
Flock\/
Florienzh\/
fluffy
Flunky
flynxapp
forensiq
FoundSeoTool
http:\/\/www.neomo.de\/
free thumbnails
Freeuploader
FreshRSS
Funnelback
Fuzz Faster U Fool
G-i-g-a-b-o-t
g00g1e\.net
ganarvisitas
gdnplus\.com
geek-tools
Genieo
GentleSource
GetCode
Getintent
GetLinkInfo
getprismatic
GetRight
getroot
GetURLInfo\/
GetWeb
Geziyor
Ghost Inspector
GigablastOpenSource
GIS-LABS
github-camo
GitHub-Hookshot
github\.com
Goldfire Server
Go [\d\.]* package http
Go http package
Go-Ahead-Got-It
Go-http-client
go-mtasts\/
Go!Zilla
gobyus
Gofeed
gofetch
GomezAgent
gooblog
Goodzer\/
Google AppsViewer
Google Desktop
Google favicon
Google Keyword Suggestion
Google Keyword Tool
Google Page Speed Insights
Google-Podcast
Google PP Default
Google Search Console
Google Web Preview
Google-Ads-Creatives-Assistant
Google-Ads-Overview
Google-Adwords
Google-Apps-Script
Google-Calendar-Importer
Google-HotelAdsVerifier
Google-HTTP-Java-Client
Google-SMTP-STS
Google-Publisher-Plugin
Google-Read-Aloud
Google-SearchByImage
Google-Site-Verification
Google-speakr
Google-Structured-Data-Testing-Tool
Google-Youtube-Links
google-xrawler
GoogleDocs
GoogleHC\/
GoogleProducer
GoogleSites
Google-Transparency-Report
Gookey
GoSpotCheck
gosquared-thumbnailer
Gotit
GoZilla
grabify
GrabNet
Grafula
Grammarly
GrapeFX
GreatNews
Gregarius
GRequests
grokkit
grouphigh
grub-client
gSOAP\/
GT::WWW
GTmetrix
GuzzleHttp
gvfs\/
HAA(A)?RTLAND http client
Haansoft
hackney\/
Hadi Agent
HappyApps-WebCheck
Hardenize
Hatena
Havij
HaxerMen
HeadlessChrome
HEADMasterSEO
HeartRails_Capture
help@dataminr\.com
heritrix
Hexometer
historious
hkedcity
hledejLevne\.cz
Hloader
HMView
Holmes
HonesoSearchEngine
HootSuite Image proxy
Hootsuite-WebFeed
hosterstats
HostTracker
ht:\/\/check
htdig
HTMLparser
htmlyse
HTTP Banner Detection
HTTP_Compression_Test
http_request2
http_requester
http-get
HTTP-Header-Abfrage
http-kit
http-request\/
HTTP-Tiny
HTTP::Lite
http\.rb\/
http_get
HttpComponents
httphr
HTTPMon
HTTPie
httpRequest
httpscheck
httpssites_power
httpunit
HttpUrlConnection
httrack
huaweisymantec
HubSpot 
HubSpot-Link-Resolver
Humanlinks
i2kconnect\/
Iblog
ichiro
Id-search
IdeelaborPlagiaat
IDG Twitter Links Resolver
IDwhois\/
Iframely
igdeSpyder
iGooglePortal
IlTrovatore
Image Fetch
Image Sucker
ImageEngine\/
ImageVisu\/
Imagga
imagineeasy
imgsizer
InAGist
inbound\.li parser
InDesign%20CC
Indy Library
InetURL
infegy
infohelfer
InfoTekies
InfoWizards Reciprocal Link
inpwrd\.com
instabid
Instapaper
Integrity
integromedb
Intelliseek
InterGET
internet_archive
Internet Ninja
InternetSeer
internetVista monitor
internetwache
intraVnews
IODC
IOI
iplabel
ips-agent
IPS\/[0-9]
IPWorks HTTP\/S Component
iqdb\/
Iria
Irokez
isitup\.org
iskanie
isUp\.li
iThemes Sync\/
IZaBEE
iZSearch
JAHHO
janforman
Jaunt\/
Java.*outbrain
javelin\.io
Jbrofuzz
Jersey\/
JetCar
Jigsaw
Jobboerse
JobFeed discovery
Jobg8 URL Monitor
jobo
Jobrapido
Jobsearch1\.5
JoinVision Generic
JolokiaPwn
Joomla
Jorgee
JS-Kit
JungleKeyThumbnail
JustView
Kaspersky Lab CFR link resolver
Kelny\/
Kerrigan\/
KeyCDN
Keyword Density
Keywords Research
khttp\/
KickFire
KimonoLabs\/
Kml-Google
knows\.is
KOCMOHABT
kouio
kubectl
kube-probe
kulturarw3
KumKie
L\.webis
Larbin
Lavf\/
leakix\.net
LeechFTP
LeechGet
letsencrypt
Lftp
LibVLC
LibWeb
Libwhisker
libwww
Licorne
Liferea\/
Lightspeedsystems
Lighthouse
Likse
limber\.io
Link Valet
link_thumbnailer
LinkAnalyser
LinkAlarm\/
linkCheck
linkdex
LinkExaminer
linkfluence
linkpeek
LinkScan
LinksManager
LinkPreview
LinkTiger
LinkWalker
Lipperhey
Litemage_walker
livedoor ScreenShot
LoadImpactRload
localsearch-web
LongURL API
longurl-r-package
looid\.com
looksystems\.net
ltx71
lua-resty-http
Lush Http Client
lwp-request
lwp-trivial
LWP::Simple
lycos
LYT\.SR
mabontland
MacOutlook\/
Mag-Net
MagpieRSS
Mail\.Ru
Mail::STS
MailChimp
Majestic12
makecontact\/
Mandrill
MapperCmd
marketinggrader
MarkMonitor
MarkWatch
Mass Downloader
masscan\/
Mata Hari
mattermost
Mediametric
Mediapartners-Google
mediawords
MegaIndex\.ru
MeltwaterNews
Melvil Rawi
MemGator
Metaspinner
MetaURI
MFC_Tear_Sample
Microsearch
Microsoft\.Data\.Mashup
Microsoft Office
Microsoft Outlook
Microsoft Windows Network Diagnostics
Microsoft-WebDAV-MiniRedir
Microsoft Data Access
MIDown tool
MIIxpc
Mindjet
Miniature\.io
Miniflux
mio_httpc
Miro-HttpClient
Mister PiX
mixdata dot com
mixed-content-scan
mixnode
Mnogosearch
mogimogi
Mojeek
Mojolicious \(Perl\)
Monit\/
monitis
Monitority\/
montastic
MonTools
Moreover
Morfeus Fucking Scanner
Morning Paper
MovableType
mowser
Mr\.4x3 Powered
Mrcgiguy
MS Web Services Client Protocol
MSFrontPage
mShots
MuckRack\/
muhstik-scan
MVAClient
MxToolbox\/
myseosnapshot
nagios
Najdi\.si
Name Intelligence
NameFo\.com
Nameprotect
nationalarchives
Navroad
NearSite
Needle
Nessus
nettle
Net Vampire
NetAnts
NETCRAFT
NetLyzer
NetMechanic
NetNewsWire
Netpursual
netresearch
NetShelter ContentScan
Netsparker
NetTrack
Netvibes
NetZIP
Neustar WPM
NeutrinoAPI
NewRelicPinger
NewsBlur .*Finder
NewsGator
newsme
newspaper\/
NetSystemsResearch
Nexgate Ruby Client
nghttp2
NG-Search
Nibbler
NICErsPRO
NihilScio
Nikto
nineconnections
NLNZ_IAHarvester
Nmap Scripting Engine
node-superagent
node-urllib
node\.io
Nodemeter
NodePing
nominet\.org\.uk
nominet\.uk
Norton-Safeweb
Notifixious
notifyninja
NotionEmbedder
nuhk
nutch
Nuzzel
nWormFeedFinder
nyawc\/
Nymesis
NYU
Observatory\/
Ocelli\/
Octopus
oegp
Offline Explorer
Offline Navigator
OgScrper
okhttp
omgili
OMSC
Online Domain Tools
OpenCalaisSemanticProxy
Openfind
OpenLinkProfiler
Openstat\/
OpenVAS
OPPO A33
Optimizer
Open Source RSS
Orbiter
OrgProbe\/
orion-semantics
Outlook-Express
Outlook-iOS
ow\.ly
Owler
Owlin
ownCloud News
OxfordCloudService
Page Valet
page_verifier
page scorer
page2rss
PageFreezer
PageGrabber
PagePeeker
PageScorer
PageThing
Pagespeed\/
Panopta
panscient
Papa Foto
parsijoo
Pavuk
PayPal IPN
pcBrowser
Pcore-HTTP
PDF24 URL To PDF
Pearltrees
PECL::HTTP
peerindex
Peew
PeoplePal
Perlu -
PhantomJS Screenshoter
PhantomJS\/
Photon\/
phpservermon
php-requests
Pi-Monster
Picscout
Picsearch
PictureFinder
Pimonster
ping\.blo\.gs
Pingability
PingAdmin\.Ru
Pingdom
Pingoscope
PingSpot
pinterest\.com
Pixray
Pizilla
Plagger\/
Pleroma 
Ploetz \+ Zeller
Plukkie
plumanalytics
PocketImageCache
PocketParser
Pockey
PodcastAddict\/
POE-Component-Client-HTTP
Polymail\/
Pompos
Porkbun
Port Monitor
postano
postfix-mta-sts-resolver
PostmanRuntime
postplanner\.com
PostPost
postrank
PowerPoint\/
Prebid
Prerender
Priceonomics Analysis Engine
PrintFriendly
PritTorrent
Prlog
probethenet
Project ?25499
Project-Resonance
prospectb2b
Protopage
ProWebWalker
proximic
PRTG Network Monitor
pshtt, https scanning
PTST 
PTST\/[0-9]+
Pump
python-httpx
Python-httplib2
python-requests
Python-urllib
Qirina Hurdler
QQDownload
QrafterPro
Qseero
Qualidator
QueryN Metasearch
queuedriver
quic-go-HTTP\/
QuiteRSS
Quora Link Preview
Qwantify
Radian6
RadioPublicImageResizer
Railgun\/
RankActive
RankFlex
RankSonicSiteAuditor
Re-re Studio
ReactorNetty
Readability
RealDownload
RealPlayer%20Downloader
RebelMouse
Recorder
RecurPost\/
redback\/
ReederForMac
Reeder\/
ReGet
RepoMonkey
request\.js
reqwest\/
ResponseCodeTest
RestSharp
Riddler
Rival IQ
Robosourcer
Robozilla
ROI Hunter
RPT-HTTPClient
RSSOwl
RSSMix\/
RyowlEngine
safe-agent-scanner
SalesIntelligent
Saleslift
Sendsay\.Ru
SauceNAO
SBIder
sc-downloader
scalaj-http
Scamadviser-Frontend
scan\.lol
ScanAlert
Scoop
scooter
ScoutJet
ScopeContentAG-HTTP-Client
ScoutURLMonitor
ScrapeBox Page Scanner
Scrapy
Screaming
ScreenShotService
Scrubby
Scrutiny\/
search\.thunderstone
Search37
searchenginepromotionhelp
Searchestate
SearchExpress
SearchSight
SearchWP
Seeker
semanticdiscovery
semanticjuice
Semiocast HTTP client
Semrush
sentry\/
SEO Browser
Seo Servis
seo-nastroj\.cz
seo4ajax
Seobility
SEOCentro
SeoCheck
SEOkicks
SEOlizer
Seomoz
SEOprofiler
SEOsearch
seoscanners
seositecheckup
SEOstats
servernfo
sexsearcher
Seznam
Shelob
Shodan
Shoppimon
ShopWiki
shortURL lengthener
ShortLinkTranslate
shrinktheweb
Sideqik
Siege
SimplePie
SimplyFast
Siphon
SISTRIX
Site-Shot\/
Site Sucker
Site24x7
SiteBar
Sitebeam
Sitebulb\/
SiteCondor
SiteExplorer
SiteGuardian
Siteimprove
SiteIndexed
Sitemap(s)? Generator
SitemapGenerator
SiteMonitor
Siteshooter B0t
SiteSnagger
SiteSucker
SiteTruth
Sitevigil
sitexy\.com
SkypeUriPreview
Slack\/
slider\.com
sli-systems\.com
slurp
SlySearch
SmartDownload
SMRF URL Expander
SMUrlExpander
Snake
Snappy
SnapSearch
Snarfer\/
SniffRSS
sniptracker
Snoopy
SnowHaze Search
sogou web
SortSite
Sottopop
sovereign\.ai
SpaceBison
SpamExperts
Spammen
Spanner
spaziodati
SPDYCheck
Specificfeeds
speedy
SPEng
Spinn3r
spray-can
Sprinklr 
spyonweb
sqlmap
Sqlworm
Sqworm
SSL Labs
ssl-tools
StackRambler
Statastico\/
Statically-
StatusCake
Steeler
Stratagems Kumo
Stripe\/
Stroke\.cz
StudioFACA
StumbleUpon
suchen
Sucuri
summify
SuperHTTP
Surphace Scout
Suzuran
swcd 
Symfony BrowserKit
Symfony2 BrowserKit
Syndirella\/
SynHttpClient-Built
Sysomos
sysscan
Szukacz
T0PHackTeam
tAkeOut
Tarantula\/
Taringa UGC
TarmotGezgin
tchelebi\.io
techiaith\.cymru
Teleport
Telesoft
Telesphoreo
Telesphorep
Tenon\.io
teoma
terrainformatica
Test Certificate Info
testuri
Tetrahedron
TextRazor Downloader
The Drop Reaper
The Expert HTML Source Viewer
The Knowledge AI
The Intraformant
theinternetrules
TheNomad
Thinklab
Thumbshots
ThumbSniper
Thumbor
timewe\.net
TinEye
Tiny Tiny RSS
TLSProbe\/
Toata
topster
touche\.com
Traackr\.com
tracemyfile
Trackuity
TrapitAgent
Trendiction
Trendsmap
trendspottr
truwoGPS
TryJsoup
TulipChain
Turingos
Turnitin
tweetedtimes
Tweetminster
Tweezler\/
twibble
Twice
Twikle
Twingly
Twisted PageGetter
Typhoeus
ubermetrics-technologies
uclassify
UdmSearch
unchaos
unirest-java
ultimate_sitemap_parser
UniversalFeedParser
Unshorten\.It
unshortenit
Untiny
UnwindFetchor
updated
updown\.io daemon
Upflow
Uptimia
URL\/Emacs
Urlcheckr
URL Verifier
URLitor
urlresolver
Urlstat
URLTester
UrlTrends Ranking Updater
URLy Warning
URLy\.Warning
Vacuum
Vagabondo
VB Project
vBSEO
VCI
via ggpht\.com GoogleImageProxy
Virusdie
visionutils
vkShare
VoidEYE
Voil
voltron
voyager\/
VSAgent\/
VSB-TUO\/
Vulnbusters Meter
VYU2
w3af\.org
W3C_Unicorn
W3C-checklink
W3C-mobileOK
WAC-OFU
Wallpapers\/[0-9]+
WallpapersHD
WakeletLinkExpander
wangling
Wappalyzer
WatchMouse
WbSrch\/
WDT\.io
web-capture\.net
Web-sniffer
Web Auto
Web Collage
Web Enhancer
Web Fetch
Web Fuck
Web Pix
Web Sauger
Web spyder
Web Sucker
Webalta
Webauskunft
WebAuto
WebCapture
WebClient\/
webcollage
WebCookies
WebCopier
WebCorp
WebDataStats
WebDoc
WebEnhancer
WebFetch
WebFuck
WebGazer
WebGo IS
WebImageCollector
WebImages
WebIndex
webkit2png
WebLeacher
webmastercoffee
webmon 
WebPix
WebReaper
WebSauger
webscreenie
Webshag
Webshot
Website Quester
websitepulse agent
WebsiteQuester
Websnapr
WebSniffer
Webster
WebStripper
WebSucker
webtech\/
Webthumb\/
WebThumbnail
WebWhacker
WebZIP
WeLikeLinks
WEPA
WeSEE
wf84
Wfuzz\/
wget
WhatCMS
WhatsApp
WhatsMyIP
WhatWeb
WhereGoes\?
Whibse
WhoAPI\/
WhoRunsCoinHive
Whynder Magnet
WinHTTP\/
WinHttp-Autoproxy-Service
Windows-RSS-Platform
WinPodder
wkhtmlto
wmtips
Woko
Wolfram HTTPClient
woorankreview
Word\/
WordPress\/
worldping-api
WordupinfoSearch
wotbox
WP Engine Install Performance API
WP Rocket
wpif
wprecon\.com survey
WPScan
wscheck
Wtrace
WWW-Collector-E
WWW-Mechanize
WWW::Document
WWW::Mechanize
www\.monitor\.us
WWWOFFLE
x09Mozilla
x22Mozilla
XaxisSemanticsClassifier
XenForo\/
Xenu Link Sleuth
XING-contenttabreceiver
xpymep([0-9]?)\.exe
Y!J-(ASR|BSC)
Y\!J-BRW
Yaanb
yacy
Yahoo Link Preview
YahooCacheSystem
YahooMailProxy
YahooYSMcm
YandeG
Yandex(?!Search)
yanga
yeti
Yo-yo
Yoleo Consumer
yomins\.com
yoogliFetchAgent
YottaaMonitor
Your-Website-Sucks
yourls\.org
YoYs\.net
YP\.PL
Zabbix
Zade
Zao
Zauba
Zemanta Aggregator
Zend_Http_Client
Zend\\Http\\Client
Zermelo
Zeus 
zgrab
ZnajdzFoto
ZnHTTP
Zombie\.js
Zoom\.Mac
ZoteroTranslationServer
ZyBorg
[a-z0-9\-_]*(bot|crawl|archiver|transcoder|spider|uptime|validator|fetcher|cron|checker|reader|extractor|monitoring|analyzer|scraper)