In the figure, \(AB\) is parallel to \(CD\). Find \(x\), \(y\) and \(z\) if \(\angle COH = 79^{\circ}\) and \(\angle CHO = 49^{\circ}\).
 
YCIND_251021_7689_pic_30.png
 
\(x =\) \(^{\circ}\)
 
\(y =\) \(^{\circ}\)
 
\(z =\) \(^{\circ}\)