Andy has 63 blue buttons and 74 green buttons. He takes turns placing equal groups of blue and green buttons into his design. The number of blue buttons Andy has left after placing each group into his design follow the rule subtract four. The number of green buttons Andy has left after placing each group into his design follow the rule subtract six. Write number patterns to find how many buttons Andy has left after placing four groups of blue buttons and four groups of green buttons into his design.