P63种情况P7P8(5)(6)(7)(8)P9P13P14P15P16(2)(1)P18P18(4)(3)P19(2)(1)P19(4)(3)P21-(1)P21-(2)P21-(3)P21-(4)P34-(3)P34-(4)P35-(1)P35-(2)P36-(3)P36-(4)P40-4P41-5P41-6P42-7P43-1P43-2P44-(1)P44-(2)P45-(3)P45-(4)P46-(5)P46-(6)P47-(7)P47-(8)P48-(9)P48-(10)P49-(11)P49-(12)P50-(13)P50-(14)P51-(15)P51-(16)P52-(17)P52-(18)P57-(1)P58-(2)P59-1BABAP60-2P61-(1)P61-(2)P62-(3)P62-(4)P63-2P64-3P65-4P66-5P67-(1)P67-(2)P68-(3)P68-(4)P69-7P69-8P70-9P71-10P71-11P72-12P72-13P73-14P73-15P74-(1)P74-(2)P75-(3)P75-(4)P76-(5)P77-(1)P78-(2)P79-(3)P79-(4)注意问题：注意问题：
