Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to get rid of smoke smell [title] Let the book air out. [step] Gently hang an open book over a railing or on a clothesline outside for a few hours to a day. This should cause the smell to decrease.

Ending1: [substeps] Make sure that you choose a shaded spot since sunlight can bleach the pages. [title] Seal the book in a container of potpourri. Ending2: Pour out any excess oil as soon as you walk away from it. [substeps] Covering the book with newspaper will let the oils pool in the spine, which means it'll absorb as much of the oil as possible, easing your stuffy nose. Ending3: Placing a dampened towel over the open book for longer might trigger smoke. [title] Tap clean dust off the surface with a pea coat. Ending4: [substeps] You can also place a vapor diffuser close to a window and let the air seep out from inside the book. Airless burns are not safe for children or people who have relatively sensitive skin or live in places with high humidity.

Answer format: ending1/ending2/ending3/ending4