MP = 16 ,, where NP = 13
therefore : MP - NP = MN <=> MN = 16 - 13 <=> MN = 3
MP = 16 ,, where MO = 9
therefore : MP - MO = OP <=> 16 - 9 = MO <=> MO = 7
MO = 7 & MN = 3
therefore : MO - MN = NO <=> NO = 7 - 3 <=> NO = 4
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