Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.

Example Input: 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 ?.
Example Output: Therefor means for that. For example: Here we sell guitars and accessories therefor. Therefor is one of a whole series of adverbs: thereof (of that), thereafter(after that), therein (in there), etc. If you are familiar with German - the Germanic sister of English - you can find a direct analogy there: for = fur therefor, for that = dafur (literally, therefor) Therefore, as you must know, means as a (logical) consequence

Example Input: Consider this quote from Mark Twain: 'Familiarity breeds contempt - and children.' Does it mean having children is a bad thing? Could you explain what the children imply here?.
Example Output: Two thoughts are run together: Familiarity breeds contempt {knowing people very well lets you see their faults} Familiarity breeds children {physical familiarity between the sexes leads to children} Hence Familiarity breeds contempt and children. A similar example of this particular way of playing with words (called Zeugma) is: 'You are free to execute your laws, and your citizens, as you see fit.'

Example Input: Possible Duplicate: Person, Persons, People, Peoples Correct usage of 'persons' (vs. 'people') What's the correct plural of person? Persons or people?.
Example Output:
Both are correct and both are required in English language, you just have to know how to use them. People denotes a group, an unspecified number of people, for example: The people in the area have been warned about the possible risks. Persons refers to persons individually and denotes an exact number which can be, or should be able to, expressed in numbers, for example: Which persons are responsible for this fire? Remember that persons is usually used in law and legal documents, like: Lessor shall not be responsible for damage to Lessee's vehicle, whether or not such damage is caused by other vehicles or persons in the parking lot and surrounding area. Only such persons who are nominated in accordance with the procedures set forth in this section ...