One way would be to put all things related to $bar in it's own block:

{ my $bar = "I can see you"; }
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Jeff

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
F--F--F--F--F--F--F--F--
(the triplet paradiddle)