Replacing y with i

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MGSGKMIWTSEIPPAHKFOL QFTUBEAUTIFULLSVWFKI IFUUKPSGYSCOLKQBZRUV MURPDEILPERKHAAICEPL VNDUWHOWRKCLOBDLDERI JNILJYBKEAWIISUINVCH HIEZTTSAIICEKMRNEJHO BESTHEEAPBSTSCICJSTO USTBIYLQPSBIFEIRHSAD STVNJIPXIDLFSGMMEXAM IDOFLQOXZYROWAAIFBNA EPMUWQKBVDMIMVPTJSGU SAANUMKDSGDXEPJGDCRS TYDNKVIXCHBXIDRQWOIB CAQIREIPPAHZPEVMQNEZ UHPELONGTUCZIMDRJBRC ZCXRFJKCBIHSVBLJKHOA GLUPUZLBAVUDJGRJWVPV BUNNIESCNBTMFOIUDMTS VTLFNUELPSTVXBASGNFB
1.
babies
2.
ladies
3.
happiest
4.
happier
5.
zippiest
6.
zippier
7.
dried
8.
replied
9.
ponies
10.
beautiful
11.
sturdiest
12.
clumsily
13.
pennies
14.
livlihood
15.
angrier
16.
bunnies
17.
busier
18.
busiest
19.
funnier
20.
funniest