//Set union A | B
//Set intersection A & B
//Set subtraction A & ~B
//Set negation ALL_BITS ^ A or ~A
//Set bit A |= 1 << bit
//Clear bit A &= ~(1 << bit)
//Test bit (A & 1 << bit) != 0
//Extract last bit A&-A or A&~(A-1) or x^(x&(x-1))
//Remove last bit A&(A-1)