Formations Available for Addition

Here the formations free edge, fissure, bay, cove and fjord of single coronoids C are considered. 

Definition 6.6 A free edge, fissure, bay, cove or fjord of C is said to be available for addition (of a hexagon) if a hexagon can be fused to the free edge, made to fill the fissure, embedded in the bay, made to cover the cove or immersed in the fjord of C, respectively, so that a new single coronoid is generated. 

Every single coronoid (C) has free edges available for addition (viz. fusion), a fact in consistency with the discussion of Par. 6.5.2. An analogous rule does not exist among the other formations in question. 

The situation for coves is different every cove (inner or outer) of C is evidently available for addition of a hexagon. A fjord of C is always available for addition except for the inner fjords of a naphthalene hole it is not allowed to immerse a hexagon into a fjord of a naphthalene hole of C when a new coronoid is supposed to be generated. 

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