Universal 853:

Original: An unvoiced stop in initial clusters is never preceded immediately by a stop differing only by voicing, and in final systems is never immediately followed by such a stop.
Standardized: IF an unvoiced stop is preceded immediately by a stop in an initial cluster, THEN they will not only differ in voicing.
IF an unvoiced stop is immediately followed by a stop in a final cluster, THEN they will not only differ in voicing.
Keywords: consonant cluster, initial, final, stop, phoneme order, voice
Domain: phonology
Type: no genuine implication; rather: provided that
Status: achronic
Quality: absolute
Basis: sample of 104 languages in Greenberg 1964
Source: Greenberg 1964 [Greenberg 1965: 17, Greenberg 1978e: 257, #11]

FP