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  1. or download this
    perl -Dt -e '"$a$b".$c.$d'   

...
(-e:1)    gvsv(main::d)
(-e:1)    concat
(-e:1)    leave
  2. or download this
    perl -MO=Deparse -e '"$a$b".$c.$d'
"$a$b" . $c . $d;