Statement

James Joyce is composing a new mind-blowing masterpiece. In his next work, two words w_1 and w_2 will be allowed to be adjacent only if they are close enough. We define w_2 to be close enough to w_1 (or that w_1 jumps to w_2) if one of the following conditions is verified: (1) w_2 is obtained from w_1 by deleting one letter. (2) w_2 is obtained from w_1 by replacing one of the letters in w_1 by some letter that appears to its right in w_1 and which is also to its right in alphabetical order. For example, we can jump from abbca to abca by deleting the second (or the third) letter. We can jump from aabca to abbca by replacing the a in the second position by the letter b that appears to the right of the a in aabca and which is also to its right in alphabetical order. On the other hand, we cannot jump from abbca to aabca since we would need to replace the b in the second position by a, but a is to the left of b in alphabetical order...