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Vowels 8 and 15, /ʊ/ versus /ɔɪ/    3 pairs      

Only three pairs emerged from the computer's search. There is no particular reason for there not to be more. It is a contrast between a short vowel and a diphthong with fairly close starting positions but a difference of lip-rounding. I have not heard of it being a problem to any learner.

The density figure is too small to be worth calculating.

bull boil 	
  bulls boils 
full foil 

Credit: John Higgins