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The difficulty of analysis of any subsystem in the phonology is an inverse function of the size -- smaller systems are more troublesome -- for any given degree of morphophonemic complexity.

This hypothesis will account for a large part of the difficulties of tonal analysis, as well as the fact that vowel systems are often more puzzling than consonantal systems.

The statement of the system is a different matter.

Smaller systems can of course be stated much more succinctly.

A phonemic system can be stated without reference to morphophonemics, but it cannot always be found without morphophonemics.

And the more complex the morphophonemic system is in relation to the phonemic base, the less easily a phonemic system will be analysed without close attention to the morphophonemics -- at least, the less satisfying will a phonemic statement be if it cannot be related through morphophonemic rules to grammatically meaningful structures.