问题描述：
Relation R is given by matrix
（1 0 0 0
1 1 0 1
1 1 1 1
0 0 0 1）
Is R an order?If yes,what its minimal,maximal,least,and greatest
elements are?
（1 0 0 0
1 1 0 1
1 1 1 1
0 0 0 1）
Is R an order?If yes,what its minimal,maximal,least,and greatest
elements are?
问题解答：
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