Bug in CS. “as if” exists in the dictionary as a single word conjunction. When compiling your script, cs notices the two words can be treated as one, so the compiled script is looking for as_if. but the code that considers sequences of words (in :prepare the area that says “sequences”, sees it and discards it because it is not a primary part of speech (noun,verb, adjective, adverb). So it doesnt mark the sequence. Fixed for next release.