Salt is the opposite of Black. Black is the opposite of Bright. Bright is related to Light. Flash can be used for Light. 
Animal is related to Forest. you are likely to find Dirt in/at/on Forest. 
Salt <--Antonym--> Black <--Antonym--> Bright <--RelatedTo--> Light <--UsedFor-- Flash 
Animal <--RelatedTo--> Forest <--AtLocation-- Dirt 