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.

[EX Q]: Question: I wrote this sentence: Why wouldn't it be valid? --and I realized that without the contraction it becomes: Why would it not be valid? As opposed to "why would not it be valid," as the contraction would imply. What's going on here? Why can I contract across the middle word this way? Or, to put it the other way, why can't I "de-contract" this without moving the not over by a word? 
Answer: It reflects an older sentence structure of English which is no longer used. You placed the negative immediately after the verb it was negating ('not' placed after 'would'). This structure was used when the contraction first developed. That placement of the negative has changed but is preserved in the contraction.
[EX A]: no

[EX Q]: Question: The Law of Demeter ("talk only to your friends") is a good place to start, but think about it this way: you can play with your toys, with toys that you make, and with toys that someone gives you. You don't ever, ever play with your toy's toys. Source: The Thoughtworks Anthology What could the last sentence mean? Could a toy have a toy? Assuming a toy means "A toy is an item that is used in play", a toy can never have a toy, so one cannot play with a toy's toys (it's physically not possible). The context is object oriented programming. 
Answer: As other people have said, it's a badly worded analogy, around the fact that you shouldn't directly interact with items you don't directly own (or have been given permission to interact with). A better analogy would be: you have a sandwich, and your partner has a sandwich. You can eat your sandwich if you want, but you shouldn't eat your partner's sandwich without their permission. Otherwise, there may be trouble when they get and try to eat it...
[EX A]: no

[EX Q]: Question: Is there a single word that means "Being merry at Christmas" but excludes being merry or happy at New Year? 
Answer: christmasyaynewyearsnay: Christmas Yay New Years Nay I think this sums it up in a very matter-of-fact way and is also how I feel regarding the matter =D.
[EX A]:
no