my @array = ( "a", "b", "c" );
my $aref = [ "x", "y", "z" ];
push @array, $aref;
# Current value for @array:
#@array = (
#           "a",
#           "b",
#           "c",
#           [
#             "x",
#             "y",
#             "z"
#           ],
#         )