For example, in the utterance P.EH1.N S.AH0.L (pencil), if the learner has P.EH1.N and P.EH1.N S.AH0.L in its lexicon but P.EH1.N is more frequent, it may fail to recall P.EH1.N S.AH0.L when examining the second syllable but succeed in recognizing P.EH1.N in the first.
it will break off P.EH1.N instead of P.EH1.N S.AH0.L.