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questions to which, because of the characteristics of the mind, there is no possible answer. One of these is "Give me an unknown time." As soon as the preclear starts to answer such a question, he of course has as-ised a certain amount of unknownness and will know the time. The answer to a fade-away question is measurable, however, it could be said arbitrarily to be answered when the preclear has as-ised enough unknownness to give a known time. There are relatively few of these questions. (PAB 43)