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$ perl -e '@_ = qw{a bcd ef}; print @_'
abcdef

$ perl -e '@_ = qw{a bcd ef}; print "@_"'
a bcd ef

$ perl -e '@_ = qw{a bcd ef}; print qq{@_}'
a bcd ef

$ perl -e '@_ = qw{a bcd ef}; { local $" = " "; print "@_" }'
a bcd ef
...
a
bcd
ef