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= 3 per (y+1)(y+4) + 1 per y+4
= 3 per (y+1)(y+4) + 1(y+1)per (y+1)(y+4)
= 3 per (y+1)(y+4) + y+1 per (y+1)(y+4)
= 3+1+y per (y+1)(y+4)
= 4+y per (y+1)(y+4)
= 1 per y+1