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grep $_ == 3 .. $_ == 7, 1..10 # ==> (3, 4, 5, 6, 7)
map $_ == 3 .. $_ == 7, 1..10 # ==> (0, 0, 0, 0, 0, 0, 1, 0, 0, 0)
map scalar($_ == 3 .. $_ == 7), 1..10 # ==> (,,1,2,3,4,5E0,,,)
map $_ == 3 .. $_ == 7, 1 # ==> (0) map $_ == 3 .. $_ == 7, 2 # ==> (0) ... map $_ == 3 .. $_ == 7, 8 # ==> (0) map $_ == 3 .. $_ == 7, 9 # ==> (0) map $_ == 3 .. $_ == 7, 10 # ==> (0)
1 == 3 .. 1 == 7
"" .. ""
0 .. 0
map $_ == 3 .. $_ == 7, 3
map $_ == 3 .. $_ == 7, 7
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