How to find the least, greatest, minimal, amd maximal elements from this matrix?

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I've shown that it's an order but I'm not sure how to find the least, greatest, minimal, and maximal elements. a,b,c,d aren't defined which confuses me.

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$a$, $b$, $c$, and $d$ can be defined to correspond to rows $0,1,2,$ and $3$ of the matrix. Row $3$ says for instance that $c$ $R$ $a$, $c$ $R$ $b$, and $c$ $R$ $c$, but that $c$ does not $R$ $d$. Does this give you enough information to solve the problem?