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$ perl -e 'print join(", ",qw(1 3 6 2));'
1, 3, 6, 2

[jeroen@rulffk]  perl -e 'print join(", ",(1 3 6 2));'
Number found where operator expected at -e line 1, near "1 3"
...
Number found where operator expected at -e line 1, near "6 2"
    (Missing operator before  2?)
Execution of -e aborted due to compilation errors.