Step 3: Part P3: Top Slot Piece
1. Measure and score a 20” X 30” rectangular piece of cardboard (S1) using a ruler (T3) and pencil (T4).
2. Score one 9” X 3” rectangle with a pencil (T4) on the 20” X 30” piece of cardboard (S1).
3. Cut out the 9” X 3” rectangle with a utility knife (T2) along the marks made.
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