See BP860 for the more general version of this solution.
Shape can be combined with a copy of itself such that they are locked together vs. not so.
Leo Crabbe
Bongard Problems with "world" finitely many closed thin non-nested non-crossing black 2D shape outlines vs. other Bongard Problems.
Bongard Problems with "world" finitely many closed thin non-nested non-crossing black 2D shape outline vs. other Bongard Problems.
Bongard Problems with "world" finitely many closed thin non-nested black 2D shape outline vs. other Bongard Problems.
Bongard Problems with "world" finitely many closed thin black 2D shape outline vs. other Bongard Problems.
Aaron David Fairbanks