There is no recognizable rule for the normal language user. They only have a phonotactic feeling – and lexical knowledge. Derivation does not follow specific, strict rules – in every language. It has a set of affixes which can sometimes be applied on the same word or stem or root which also proves that it is not merely a matter of morphonology, but at best of phonotactic restrictions. Country names are foreign words, therefore often disrespect the syllable structure of the language using this word as a morphological base, and so, restrictions arise, and alternatives are preferred.
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