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perl -e"keys %hash = 2_000_000; <>; $hash{ $_ }++ for 1 .. 2_000_000; 
+<>;"

D:\>perl -we"'X'x(200*1024**2); <>; $h{ $_ }++ for 1 .. 2_000_000;<>"
Useless use of repeat (x) in void context at -e line 1.
Name "main::h" used only once: possible typo at -e line 1.