fix bug in check_cyclic(). Bug can be reproduced by

angbisec_bline_cyclic
a b c = triangle; f = on_bline f b c, angle_bisector f b a c ? cyclic a b c f

Also in google-deepmind#16 (Fix incorrect tuple unpacking in check_cyclic google-deepmind#16)

numericals.py

@@ -702,7 +702,7 @@ def check_perp(points: list[Point]) -> bool:
 
 def check_cyclic(points: list[Point]) -> bool:
   points = list(set(points))
-  (a, b, c), *ps = points
+  (a, b, c, *ps) = points
   circle = Circle(p1=a, p2=b, p3=c)
   for d in ps:
     if not close_enough(d.distance(circle.center), circle.radius):