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- on time, punctual, prompt
- to be on time, to be punctual
- challenge, test, difficult task
- to challenge, to test, to take on
- answer, solution, reply
- key, answer key (to questions or problems)
- to maintain, to protect, to safeguard
- maintenance, protection, upkeep
- typical, characteristic, representative
- classic example, model, archetype
- restriction, limitation, constraint
- to restrict, to limit, to constrain
- awake, conscious, alert
- sober, not intoxicated
- clear-headed, lucid
- to wake up, to become sober
- war, warfare, armed conflict between nations or groups
- immigrant, migrant
- to immigrate, to migrate, to move to another country or region
- product, goods, merchandise
