problem_246.js

// This problem was asked by Dropbox.

// Given a list of words, determine whether the words can be chained to form a circle. A word `X` can be placed in front of another word `Y` in a circle if the last character of `X` is same as the first character of `Y`.

// For example, the words `['chair', 'height', 'racket', touch', 'tunic']` can form the following circle: `chair --> racket --> touch --> height --> tunic --> chair`.