Anyone who loves Scrabble or this site is probably familiar with anagrams. But what about Add-A-Grams? An Add-A-Gram takes a word, adds a letter, and then shuffles the letters to make a new word (I guess you can call this an Add-A-Gram's Add-A-Grammar). In this game, I will define an Add-A-Gram chain, and a solution should contain the complete list of words in the chain.
For example, if I provided this definition: depend inside a race inside a counselor
The answer would be: rely -> relay -> lawyer
OK here is the definition for this Add-A-Gram chain:
a pentomino inside an element inside formerly inside a valley inside a compound inside an appendage inside choose inside a doctor inside most ephemeral inside injuries inside one without choices inside an inflammation inside chamber works