is_valid_for_hybridising_trigger

is_valid_for_hybridising_trigger = {
	$CHARACTER$ = {
		culture = {
			NOT = { has_same_culture_heritage = $CULTURE$ }
			culture_age >= culture_hybrid_cooldown
		}
		trigger_if = {
			limit = {
				NAND = {
					exists = var:special_culture
					var:special_culture = $CULTURE$
				}
			}
			custom_description = {
				text = culture_present_in_realm_for_hybridization
				any_sub_realm_county = {
					culture = $CULTURE$
				}
			}
		}
		custom_description = {
			text = culture_is_not_parent_culture
			culture = {
				NOT = {
					any_parent_culture = {
						this = $CULTURE$
					}
				}
			}
		}
		custom_description = {
			text = culture_is_not_child_culture
			$CULTURE$ = {
				NOT = {
					any_parent_culture = {
						this = $CHARACTER$.culture
					}
				}
			}
		}
	}
}

As written in game/common/scripted_triggers/00_cultural_triggers.txt.