Unlock codes - Take Me Back and other

Another way of PIU Pro unlock codes:
Solitary 2 - 5 (7+9) 5 (7+9) 5 (7+9) (1+3)
Take Me Back - 1 5 9 1 5 9 (1+9) (1+9) (3+7) (1+9)
Understand - 7 9 5 9 7 3 5 3 7