There is a slight ambiguity here regarding whether a shape could be placed within another shape's hole. This is a question of how one perceives the Problem: are we sliding shapes around on a table in 2D or are we allowed to 'lift' them in 3D space?
Adjacent-numbered pages: BP887 BP888 BP889 BP890 BP891  *  BP893 BP894 BP895 BP896 BP897
nice, precise, perfect, pixelperfect, help
Leo Crabbe