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my @x = qw(a b c);
my @y = qw(d e);
print scalar (@x, @y);       # prints "2" (number of elems in @y)

print scalar qw(a b c d e);  # prints "e" (last elem in list)

print scalar ((@x, @y)[0..@x+@y-1]);      # prints "e"
print scalar sub {@_[0..$#_]}->(@x, @y);  # prints "e"