Board End Cars on Crowded Lines — Middle Doors Pack First

Board End Cars on Crowded Lines sounds like a micro-optimization until you are in a Jinjiang apartment where the dehumidifier runs like a second roommate.

A student I met at a language exchange once missed the last metro by thirty seconds and learned new vocabulary from myself. The fix took less time than telling the story.

Try this once: write the rule on your phone lock screen for three days. If it survives, it is yours.

Works for me in Chengdu humidity.