A similar statement (cf. ) for initial clusters holds in almost all cases (that is, the existence of at least one cluster consisting of a nasal (voiced or unvoiced) followed by a heterogenic obstruent implies the existence of at least one cluster consisting of a nasal (voiced or unvoiced) followed by a homorganic obstruent.
Standardized
In initial clusters, IF there is at least one cluster consisting of a nasal (voiced or unvoiced) followed by a heterogenic obstruent, THEN there is at least one cluster consisting of a nasal (voiced or unvoiced) followed by a homorganic obstruent.
A number of Slavic languages (e.g., Russian, Polish, Czech). They contain initial heterogenic combinations such as mg without having homorganic sequences. (Greenberg 1965: 14, 1978e: 253)