| duty(noun, condition, demand, need, requirement) |
| edge(noun, condition, demand, need, requirement) |
| establish(verb, place, set, plant, put) |
| fix(verb, place, set, plant, put) |
| fundamental(noun, condition, demand, need, requirement) |
| hold(verb, place, set, plant, put) |
| imperative(noun, condition, demand, need, requirement) |
| implant(verb, place, set, plant, put) |
| insert(verb, place, set, plant, put) |
| keep(verb, place, set, plant, put) |
| must(noun, condition, demand, need, requirement) |
| must-have(noun, condition, demand, need, requirement) |
| necessary(noun, condition, demand, need, requirement) |
| needful(noun, condition, demand, need, requirement) |
| obligation(noun, condition, demand, need, requirement) |
| permit(verb, place, set, plant, put) |
| place(verb, set, plant, put, add) |
| plant(verb, place, set, put, add) |
| plus(noun, condition, demand, need, requirement) |
| preserve(verb, place, set, plant, put) |