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1
(MMP) Problem No. 20
Solution
2
2
3
4
2 1 1
6 3 3
( 1) (3 3)
( 1) (6 6)
( 1) ( 6 6) 0
i j k
X
i X
j X
k X
parallel
? ?
? ?
? ? ? ?
? ? ?
? ? ? ?
?
b
?

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