Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make crate shelves [title] Plan a simple bookshelf design. [step] You won't know how many crates you'll need to buy or scavenge until you plan out your crate shelf. Think about how many rows of crates wide your shelf will be.

Ending1: [substeps] You'll need to plan four crates across your room and a shelf that runs up the longest side of your room. Imagine that your room is divided into two rooms and you plan on storing three crates. Ending2: Crates can be stacked one on top of the other to add height to a shelf. Keep track of the total number of crates. Ending3: Purchase shelf books that are sized to fit the height of your shelf. [substeps] A more basic bookshelf may also work, as long as it's sturdy. Ending4: You can use smaller books (the large ones might be too heavy for a shelf) or larger books (smaller books might already be grouped in these crates). Using six crates in a row gives you 15 crates.

Answer format: ending1/ending2/ending3/ending4