In final clusters, except for unvoiced obstruents followed by a voiced nasal, an unvoiced consonant or sequence of unvoiced consonants following a vowel is not followed by one or more voiced consonants.
Standardized
In final clusters, IF an unvoiced consonant or sequence of unvoiced consonants follows a vowel, THEN it will not be followed by one or more voiced consonants (except for unvoiced obstruents followed by a voiced nasal).
Cf. #866.