To solve this problem, we need to determine the minimum number of moves required to follow a sequence of dance instructions using two legs which can start on any of the available tiles: up, down, left, and right.
### Problem Analysis
1. **Tiles**: We have four tiles, which we can denote as:
- `0`: up
- `1`: down
- `2`: left
- `3`: right
2. **Instructions**: We need to read a sequence of instructions where each instruction specifies