Converse of object

• have: I would also recommend investing in one or two well slides which are thicker and have a deeper concavity.

Adjective modifier

• deep: I would also recommend investing in one or two well slides which are thicker and have a deeper concavity.

• local: Pit Point that lies in a local concavity in all directions ( all neighbors higher ).

Noun used with modifier

• surface: Plane Points that do not lie on any surface concavity or convexity.