If a letter x appears multiple times in S, we could use x(i) to denote the i-th copy of it (reading from left to right). Finally, a subsequence of S is a string obtained by deleting some letters in S. 2.1 The LLDS problem A subsequence S′ of S is a letter-duplicated ...
Won't that be fun? I will just type, and type, and never, ever use copy and paste. Wow...I really must be bored. Just goes to show what boredom can do to you. Any way, that's it for now. Wait, no it isn't, I still have to keep going, and going, and going. Because ...