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

StringFrequency
A10.509
C7.312
E10.339
R9.449
U9.240
V11.235
W9.275
Y10.226
a11.337
e10.720
i11.590
o10.547
u10.723
y11.347