 Nevertheless, semivowels may be phonemically equivalent with vowels.For example, the English word "fly" can be considered either as an open syllable ending in a diphthong or as a closed syllable ending in a consonant .It is unusual for a language to contrast a semivowel and a diphthong containing an equivalent vowel, but Romanian contrasts the diphthong with , a perceptually similar approximant-vowel sequence.