- Arrange numbers from 1 to 11, and each number can appear max twice.
- The numbers are arranged, so that any 3 numbers which forming an up-triangle sum to the desired number (S).
- A equal sign means one rectangle's number is the same number of another one.
- A line sign means one rectangle's number is adjacent to another one.
- The puzzle can be solved without computer.
- Explain your way to solve the puzzle.