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Three-consonant sequences71have been presented so far, i.e. Proper Government and InfrasegmentalGovernment, are insufficient to account for the consonant sequences ofthis type. Consider the representation of krtañ ‘larynx’ in (27).(27)??PG(C V) C V 1C V 2C| | | | |k P r P tV 3|aC|­V 4|PIn (27) V 3is obliged to properly govern the preceding V 2([rt] is nota possible IG domain). The nuclear position V 2being empty and governedcannot give licence to the preceding [r], hence the initial [kr] cannotcontract the IG relation either. In consequence, the forms representedunder (23a) above lack the governor for the nuclear position between thefirst two consonants. A similar situation arises in (28) below where twosonorants are preceded by an obstruent.(28) PG??(C V) C|bV 1|PC|rV 2|PC|nV 3|oC|­V 4|PC|t¡¡‚V 5|PIn (28) the two sonorants /-rPn-/, as potential governors, are not able tointeract with each other in the IG domain. It means that the empty nucleusV 2must be properly governed by the following filled V 3. Similarlyto the example in (27), V 2being properly governed cannot license /r/ andagain the first nucleus, i.e. V 1, remains ungoverned. The same situationoccurs within the group of forms hosting vowel-zero alternations (23c).Although the forms with the realised vowel are unproblematic as theyare simply instantiation of PG (29a), the ones with two empty nuclei ina row remain unexplained (29b).(29)a. PG b. PG(C V) C|kV|PC|rV|eC|fV|P(C V) C|k??V|PC|rVeC|fV|i