obligation - duty, promise, necessity⏎
order - request, demand, instruction, command, require⏎
proficient - able, skilled, practised, competent⏎
rate - measure, amount, decide, estimate, price⏎
quota - portion, fixed amount, limited number⏎
range - variety, vary, series, scope, portfolio⏎
prior - previous to, previously, before, earlier, happening or existing before⏎
react - be active, respond⏎
merge - combine, mix⏎
probe - investigate, inquiry, ask questions⏎