Given the task definition and input, reply with output. Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.

Question: I'm a non-native English speaker, and my automatic spellchecker seems to accept both therefore and therefor. Is one orthography preferred ? Is that a British vs. American difference ? Or an old vs. more recent orthography ? Or something else ? 
Answer: Therefore and therefor are completely different words. Therefor, an archaic word, means "for this", "for that", or "for it". E.g; ... ordering goods and enclosing payment therefor. Therefore means "for that reason" or "hence".E.g; Those people have their umbrellas up: therefore, it must be raining.

no