I’m starting to think that Trump is a zen buddhist master. Every word he says can be taken either literally or seriously. Since the two are mutually exclusive, every sentence he makes with N words has 2^N possible interpretations, assuming all interpretations are equally likely. So the probability that he makes an N-word completely true sentence is 1/2^N.
For example, a simple 5-word completely true Trump sentence occurs with a frequency of 1 in 32, or roughly 3% of the time. The longer the sentence, the smaller it is completely true, tending to a probability of zero as sentence length tends to infinity.
This is why no lawyer would advise Trump to speak with Mueller under oath.