《孙膑兵法·十阵》
要注意疏密适当，既不致于受敌军的威逼，更不致于被敌军包围、做好这一点的关键在于深思熟虑，谨慎施行。
疏而不可蹙，数而不可军者，在于慎。
You should pay attention to the proper looseness and density, neither being threatened by the enemy forces nor being surrounded by the enemy forces. The key point of doing this is to think deeply and to carry out the plan carefully.