The sisters have learned a few lessons from their recent debut. They are now ruthlessly efficient outfit-swapping machines. (You know, sort of like Valley Girl Terminators...)
They can now sustain swapping chains of 21 or more outfit pairs. In some cases, the sisters have completely exchanged outfits by the end.
No sister may wear an outfit that she has previously worn.
See if you can solve this one:
Take sisters EAR & TASTES through at least 21 more outfits by lending/borrowing one "accessory" (letter) at a time.
You will be revered eternally if you can end with the sisters' outfits completely exchanged. (I.e., ending with TASTES & EAR.) But this is not a requirement.
I am accepting TASER as a brand name which has come into common usage. Otherwise, all words are well-known. No need to reach for the dictionary.
Answer
21 changes ending with reversal:
ear tastes 0
sear taste 1
sea taster 2
seat taser 3
eat tasers 4
at teasers 5
art teases 6
tart eases 7
tarts ease 8
tars tease 9
tears teas 10
teas tears 11
tease tars 12
ease tarts 13
eases tart 14
teases art 15
teasers at 16
tasers eat 17
taser seat 18
taster sea 19
taste sear 20
tastes ear 21
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