M22 SEQUENCE
A sequence formed by any form containing two linear strokes or two arcs
angle
Alternate pattern , Mixedly, with some kind of Alternation; ‖ either with Protuberance and Dent: or with Staple and its reverse.
wave
, UNDULATED, waved, winding.
crenated , rough , repeated acute angled edges
Stairs
, right angled edges