This is a test of commonsense. Complete the next sentence:

How to make a crib sheet
Pre-wash the fabric.
This allows for any shrinkage before you start cutting the fabric to sew the crib sheet.
Cut a piece of fabric to measure 70 inches by 45 inches (1.78 m by 1.14 m).
Cut a 9-inch (22.86 cm) square from each corner of the fabric. Fold the fabric over diagonally, with right sides facing each other, and pin the 9-inch (22.86 cm) sides together to form the first corner of the crib sheet.