The phrase "wast in possession of" can be a bit tricky to spell due to the silent "e" at the end of "wast". In IPA phonetic transcription, the word would be spelled /wəst/ to account for the schwa sound in the middle. The additional "e" at the end is not pronounced, but it is needed to signal that the "a" should have a short sound. Therefore, the full phrase would be spelled /wəst ɪn pəˈzɛʃən əv/. It's important to pay attention to every letter when spelling complex phrases like this.