This BrainBashers safe has a rather unusual control panel.

In order to open the safe, you have to **press every single square** once only, in the correct sequence, ending on the square marked **E**.

Each square indicates which square to press next, for example, 2U means move up 2 squares and 3R means move right 3 squares.

Can you determine which square you must start with?

3R | 4R | 2R | 2D | 2R | 4D | 2D |

2R | 1U | 1U | 3D | 2D | 1R | 2L |

3D | 1D | 3R | 1R | 2L | 4L | 1D |

1U | 4R | 2L | 3D | 2D | 2L | 4L |

4U | 1L | 2D | E | 2R | 1D | 4L |

1R | 1D | 1R | 4U | 2R | 3L | 1D |

5U | 5U | 2L | 2R | 2U | 5U | 2L |