[5 Examples] Are any of these sound changes attested or strongly theorized?
*pl, *pr or *ps -> [pf]
*ʔw -> [b/p], ʔr or *ʔl -> [d/t] or [ɖ/ʈ]
*US -> VS, either intervocalically or generally
*m̥ -> [f/ɸ], *n̥ -> [θ/s], *ŋ̊ -> [x]
*qS -> [kS] and/or *Sq -> [Sk], while *q is otherwise generally preserved in the language
{where U is an unvoiced obstruent, S is a sonorant and V is a voiced obstruent}