OUTUNPACK
OUTUNPACK (0, c, 4);
OUTUNPACK (1, d, 5);
OUTUNPACK (2, a, 6);
OUTUNPACK (3, b, 7);
OUTUNPACK (0, a, 0);
OUTUNPACK (1, b, 1);
OUTUNPACK (2, c, 2);
OUTUNPACK (3, d, 3);