Textbook Problem

Let $A=\left\{a,b,c,d\right\}$ , and let R be the relation

$R=\left\{\left(a,a\right),\left(b,b\right),\left(c,c\right),\left(d,d\right),\left(c,b\right),\left(a,d\right),\left(c,d\right),\left(b,d\right),\left(c,d\right),\left(c,a\right)\right\}.$

Is R total order on A? Justify your answer.