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1、,P6,3种情况,P7,P8,P9,P13,P14,P15,P16,(2),(1),P18,P18,(4),(3),P19,(2),(1),P19,(4),(3),P21-(1),P21-(2),P21-(3),P21-(4),.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,P35-(1),.,.,.,.,.,.,.,.,.,.,.,.,.,.,P41-5,.,.,.,P43-1,.,P43-2,.,P44-(1),.,P44-(2),.,P45-(3),.,P45-(4),.,P46-(5),.,P46-(6),.,P47-(7),.,P4
2、7-(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),.,.,.,P61-(1),.,P61-(2),.,P62-(3),.,P62-(4),.,P63-2,.,P64-3,.,P65-4,.,P66-5,.,P67-(1),.,P67-(2),.,P68-(3),.,P68-(4),.,P69-7,.,P69-8,.,P70-9,.,P71-10,.,P71-11,.,P72-12,.,P72-13,.,P73-14,.,P73-15,.,P74-(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：,
