.. range operator (creates a list of numbers)

$ perl -le " print for 1 .. 1; "
1

$ perl -le " print for 1 .. 4; "
1
2
3
4

$ perl -le " print 1 .. 4; "
1234

$ perl -le " print 1 .. 1; "
1

$ perl -le " print 1 .. 0; "
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