Zwicky's constraints on when this combination can occur are as follows: (15) A personal pronoun NP can form a prosodic phrase with a preceding prosodic host only if the following conditions are satisfied: a. the prosodic host and the pronominal NP are sisters; b. the prosodic host is a lexical category; c. the prosodic host is a category that governs case marking.
these considerations motivate a third clause to the definition of mkMtr: if the first two elements of the list are a Prosodic Word and a Leaner, then the two of them combine to form a lnr-mtr, followed by any other material on the input list.