Kamusi (ramani, safu inayohusiana) hubaki ufunguo → thamani uhusiano, na kukuruhusu kutafuta thamani kwa ufunguo wake katika kawaida O(1). Seti ni kimsingi ramani yenye funguo lakini bila thamani — inahifadhi uanachama tu.
Mfano
python
text = .split()
counts = {}
word text:
counts[word] = counts.get(word, ) +
ages = {: , : }
ages[]
ages[] =
ages
