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Are the members that were listed by FatFork the only ones using the word ideal instead of idea (regardless of pidgin or not)? If most of the Nigerian local board are not making that error then it could be isolated to that group mentioned by FatFork and the issue suspicion is rightly attributed to them.
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Quick forum search in Nigeria (Naija) section says that majority knows the word
idea (dozens of results) and there is one person who
uses the word ideal instead. But it proves nothing this way I guess.