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Hasse Diagrams

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(a) List the ordered pairs that belong to the relation.

My ANS: (a,a),(b,a)(b,b),(c,a),(c,b),(c,c),(d,a),(d,b)(d,d)

(b) Find the (boolean) matrix of the relation.
< my answer file attached as Mr.jpg>

I did review another answer posted along the same question, but uses a different shape. I think my matrix is correct based on my pairs, but i'm concerned about the pairs.

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Hasse Diagrams are investigated.

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Your matrix is correct based on your pairs, but your pairs are not correct.
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