Please choose the correct ending to complete the given sentence: Smoking hookah: They take turns inhaling and exhaling the smoke. They exhale from their nose like they do it often and have been trained like little pros. it

Ending1: 's sort of like a karate routine but on separate strings. Ending2: is very sad these children are allowed to do this like its normal, they seem to enjoy it too. Ending3: 's a very rhythmic process and they begin moving together slowly down the parade line after a certain point. Ending4: shows the quality and safety of their lungs against smoke.

Answer format: ending1/ending2/ending3/ending4