discover_new_commander_trait_to_teach

discover_new_commander_trait_to_teach = {
	random_list = {
		1 = {
			trigger = { NOT = { has_trait = logistician } }
			set_variable = {
				name = commander_trait_being_taught
				value = flag:logistician
			}
		}
		1 = {
			trigger = { NOT = { has_trait = military_engineer } }
			set_variable = {
				name = commander_trait_being_taught
				value = flag:military_engineer
			}
		}
		1 = {
			trigger = { NOT = { has_trait = aggressive_attacker } }
			set_variable = {
				name = commander_trait_being_taught
				value = flag:aggressive_attacker
			}
		}
		1 = {
			trigger = { NOT = { has_trait = unyielding_defender } }
			set_variable = {
				name = commander_trait_being_taught
				value = flag:unyielding_defender
			}
		}
		1 = {
			trigger = { NOT = { has_trait = forder } }
			set_variable = {
				name = commander_trait_being_taught
				value = flag:forder
			}
		}
		1 = {
			trigger = { NOT = { has_trait = flexible_leader } }
			set_variable = {
				name = commander_trait_being_taught
				value = flag:flexible_leader
			}
		}
		1 = {
			trigger = {
				exists = scope:teacher.location
				scope:teacher.location = {
					OR = {
						terrain = oasis
						terrain = desert
						terrain = desert_mountains
					}
				}
				NOT = { has_trait = desert_warrior }
			}
			set_variable = {
				name = commander_trait_being_taught
				value = flag:desert_warrior
			}
		}
		1 = {
			trigger = {
				exists = scope:teacher.location
				scope:teacher.location = {
					terrain = jungle
				}
				NOT = { has_trait = jungle_stalker }
			}
			set_variable = {
				name = commander_trait_being_taught
				value = flag:jungle_stalker
			}
		}
		1 = {
			trigger = {
				exists = scope:teacher.location
				scope:teacher.location = {
					OR = {
						terrain = taiga
						geographical_region = world_tibet
						geographical_region = world_europe_north
						geographical_region = world_europe_east
						geographical_region = world_steppe
					}
				}
				NOT = { has_trait = winter_soldier }
			}
			set_variable = {
				name = commander_trait_being_taught
				value = flag:winter_soldier
			}
		}
		1 = {
			trigger = { NOT = { has_trait = reaver } }
			set_variable = {
				name = commander_trait_being_taught
				value = flag:reaver
			}
		}
		1 = {
			trigger = { NOT = { has_trait = reckless } }
			set_variable = {
				name = commander_trait_being_taught
				value = flag:reckless
			}
		}
		1 = {
			trigger = { NOT = { has_trait = holy_warrior } }
			set_variable = {
				name = commander_trait_being_taught
				value = flag:holy_warrior
			}
		}
		1 = {
			trigger = { NOT = { has_trait = open_terrain_expert } }
			set_variable = {
				name = commander_trait_being_taught
				value = flag:open_terrain_expert
			}

As written in game/common/scripted_effects/00_martial_lifestyle_effects.txt.