'ir' and 'est'

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OLDMSFQNAIYVHYXFIRMD DFXDZJGHWNWHIRLACQLC ZWWCNKYHUCDWZGJMAIHS AGATFKACSXPDVHBXWOZE LIKSSWFOMTLGHBGZIQWN ORBEVNBWLCNIEGIKDUIJ FTATVLMDBLPRLAREEIPN UHUSIDIHKQCLUUSNSCNT ADXAFIRPMYYCUKTZTKGS DIDFXZSZRNJKXOLOEEHE EIEPAKFKGQDDHZOYJSHL CASWIRLCURZVLBIRDTVL OOPMILJSNXSLOUDESTGA LPDSLRTALLESTYUPNHEM DAPMNIETMMJPETOGTTTS EYQQIWOORWQDCDCISRIE SQTLDTGGVTZZGHRXGISV TZIZSYPFSDCXGBCRNFDZ WLUHBIGGESTJZHBKNEND AKVMGEKSLFCBIRTHGGQS
1.
firm
2.
fir
3.
firth
4.
birth
5.
bird
6.
girth
7.
girl
8.
whirl
9.
swirl
10.
twirl
11.
biggest
12.
tallest
13.
fastest
14.
smallest
15.
widest
16.
quickest
17.
loudest
18.
coldest