Hi, I wouldn't know about any rule that would give /p/ characteristics of /b/ and /p/. A rule that does involve /p/ and /s/, however, could be that of the absence of aspiration in case /s/ precedes /p/. pet ?
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iwanttofly4transplant: tra:nsp...When they are verbs, you can hear aspirated versions clearly; when they are nouns, esp in fast tempo, you dont hear aspiration.
transport: tra:nsp?...