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像是AB+BC+CD+DE,
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點到點的向量,必須要是有關連的,21Please respect copyright.PENANA1uXsDAonub
8964 copyright protection17PENANAb7MLzDWKGx 維尼
像是AB+BC+CD+DE,8964 copyright protection17PENANAeCd2RXHKM8 維尼
而不能是AB+CB+DC+DE。21Please respect copyright.PENANAW6hr5gAZh4
8964 copyright protection17PENANANCWhXuwTkI 維尼
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