Types of Objects

Two distinct types of object may exist:

• Tile objects: The shape is defined by a single tesseral address.
• Zone objects: The shape is comprised of more than one address.

• Fixed : A tile or zone object with known location.
• Free : A tile or zone object which has more than one possible location.

Then the declaration:

object: A [0] [[000..003], [021]]

means that A is a tile object, which may be at any of the addresses 000, 001, 002, 003 or 021.