十六字訣
Simplified:
十六字诀
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16-character formula, esp. Mao Zedong's mantra on guerrilla warfare: 敌进我退，敌驻我扰，敌疲我打，敌退我追 when the enemy advances we retreat
when the enemy makes camp we harass
when the enemy is exhausted we fight
and when the enemy retreats we pursue
Character by character
Sources