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  1. or download this
    >perl -MO=Concise -e"$a and $b"
6  <@> leave[1 ref] vKP/REFC ->(end)
...
-           <1> ex-rv2sv vK/1 ->-
5              <#> gvsv[*b] s ->6
-e syntax OK
  2. or download this
    >perl -MO=Concise -e"if ($a) { $b }"
6  <@> leave[1 ref] vKP/REFC ->(end)
...
-              <0> ex-nextstate v ->5    / is the extra scope.
-              <1> ex-rv2sv vK/1 ->-
5                 <#> gvsv[*b] s ->6