Easy - but you need to invent (sorry: discover) the "voicesless stop disappears before sibilant" rule, or something like that. 1. Ledsa (this needs to be stressed on the 1st syllable) 2. Le:sa (application of rule above, with ensuing compensatory lengthening of preceding vowel) 3. Leisa (long front vowel becomes paired front vowel glide) 4. Leis (unstressed final vowel disppears) Mike > Anyone have any ideas about how to get from the protoform *LEDSA to the > final form _leis_?