Please choose the correct ending to complete the given sentence: Cleaning windows: The history of the squeegee is briefly presented as well as a preferred package system of window washing products and a man using those products. products involving window washing, such as a window washer, squeegee soap and a squeegee

Ending1: , are displayed on a white paper with text that read " keys free ". Ending2: power lever are shown to demonstrate how to solve a issue, while various remotes and displays record the process as well as a transitional tool used for each process. Ending3: are shown, as well as a window washer using those products when washing a window. Ending4: scraper are handed out on a big rack and the choices of quality items are presented.

Answer format: ending1/ending2/ending3/ending4