$ perl -le'
my @array = (
    [ "a", "b", "c", ],
    [ "1", "2", "3", "4", ],
    [ "x", "y", ],
    );

my $pattern = join "", map "{$_}", map join( ",", @$_ ), @array;

print for glob $pattern;
'
a1x
a1y
a2x
a2y
a3x
a3y
a4x
a4y
b1x
b1y
b2x
b2y
b3x
b3y
b4x
b4y
c1x
c1y
c2x
c2y
c3x
c3y
c4x
c4y