| 1 | We have added a major piece to that puzzle. | |
| 2 | It is like finding the last piece of jigsaw puzzle . | |
| 3 | I now had my first piece of the puzzle but it did not answer the question, Why do trees have this pattern? | |
| 4 | But we are not sure that we have found all the pieces in the jigsaw puzzle yet. | |
| 5 | These fundamental mathematical questions are not just esoteric puzzles of interest solely to mathematicians. |