The one that's always on. Warm wood, a little green, nothing to prove.
The pepper is small but load-bearing. Skip it and the wood goes to sleep. Cypress at seven is the green corridor — without it, too much warmth.
The blend you stop noticing because it's always there. Cedarwood and sandalwood set the temperature — bergamot keeps it from going dark. Cypress is the green thread that makes it smell like a room with a window open. You'll try others. You'll come back to this one.