Frequency of Vowel strings in monomorphemic English monosyllables, by Log Word-Type metrics.

StringFrequency
A6.438
C4.025
E6.103
R5.247
U4.094
V5.930
W4.860
Y5.663
a6.209
e5.961
i5.999
o6.091
u5.690
y6.267