How do pirates distribute diamonds?

We can ask this question in reverse. First, assuming that pirates 1, 2, and 3 all feed sharks, then no matter what scheme No.4 proposes, No.5 will reject it and keep it all for himself, so No.4 absolutely supports No.3' s scheme, that is, the allocation method of10/:0. However, No.4 and No.5 definitely feel the loss, so they will definitely support No.2, and No.2 will also reward No.4 and No.5, that is, the method of 99: 0: 1: 1. However, No.3 will definitely support the method of 1, and No.4 or No.5 will also support the method of 1 in order to get an extra gem. Only 98: 0: 1: 2: 0 or 98: 0: 1: 0 can pass.