2. What happens when you send a message to an objeect that doesn't implement the method?

3. (similar but not eactly to the "Letter Combinations of a Phone Number" on leetcode) // +-----+-----+-----+ // | 1 | 2 | 3 | // | | ABC | DEF | // +-----------------+ // | 4 | 5 | 6 | // | GHI | JKL | MNO | // +-----------------+ // | 7 | 8 | 9 | // |PQRS | TUV |WXYZ | // +-----------------+ // | 0 | // | + | // +--+--+ // 2 -> "A" // 22 -> "B" // 222 -> "C" // 2233 -> "BE" // Write a function that given a string of numbers as input returns all possible string translations

You have a simple tree structure Ⓐ and its clone ⓐ. Given an original tree's node Ⓑ, find and return the cloned tree's node ⓑ that is the clone of node Ⓑ. Each node in the tree has a pointer to it's parent as well as an array of it's children. Original Clone Ⓐ ⓐ ┏━┻━━┓ ┏━┻━━┓ ◯ ◯ ◯ ◯ ┏┻┓ ┏━╋━┓ ┏┻┓ ┏━╋━┓ ◯ ◯ ◯ ◯ ◯ ◯ ◯ ◯ ◯ ◯ ┏┻┓ ┃ ┏┻┓ ┃ ◯ Ⓑ ◯ ◯ ⓑ ◯