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#--------1---------2---------3---------4---------5---------6---------7
+---------8--------
#234567890123456789012345678901234567890123456789012345678901234567890
+123456789012345678
...
2:1 
2:3 
2:5

#--------1---------2---------3---------4---------5---------6---------7
+-------
#234567890123456789012345678901234567890123456789012345678901234567890
+1234567
perl -pe'@h{/([^,]*)/}|=2-@ARGV}while(@_=each%h){$_="@_"=~/[12]$/&&"$&
+:$`$/"'