Exodus25:10
And they shall make an ark of shittim wood: two cubits and a half shall be the length thereof, and a cubit and a half the breadth thereof, and a cubit and a half the height thereof.
Exodus 25 · King James Version
Learn it by heart — five steps, then Hosea brings it back just before you would forget.
Get HoseaHosea is coming to the App Store.