$17.-20.$ Consider the following diagraphs $($a$)-($h$)$ representing relations.

For each relation indicate in the table below, indicate that it is Reflexive $R,$ Symmetric $S,$

Anti$-$Symmetric A$,$ Transitive T$,$ Partial Order PO and$/$or an Equivalence

Relation ER by placing a $"+"$ in the corresponding cell. Put an $"0"$ in the other cells.

$($a$)$

$($b$)$

$($c$)$

$($d$)$

$($d$)$

$($g$)$

$($e$)$

$($f$)$

$(h)$