The On-Line Encyclopedia of Bongard Problems

Mouth concave upwards vs. Mouth convex upwards.

(edit; present; nest [left/right]; search; history)

	CROSSREFS	`Adjacent-numbered pages: BP210 BP211 BP212 BP213 BP214 * BP216 BP217 BP218 BP219 BP220`
	CONCEPT	`concave_convex_region (info \| search),` `downward_upward (info \| search),` `line_absolute_direction (info \| search),` `absolute_direction (info \| search),` `direction (info \| search)`
	AUTHOR	`Giuseppe Insana`

		Hints
(Greetings from The On-Line Encyclopedia of Bongard Problems!)