[Summary of Berko test zif, zifiz mutch, mutchiz trife, trifiz nox, noxiz noxiz grunch, grunchiz fra, fraziz pre, preziz fro, froziz tink, tinkiz tinkiz runk, runks jarf, jarfiz posh, posiz for, forziz horse, horsiz deer, deerziz cow, cowziz, then cows It is clear that he made use of ziz, particularly after vowels]