☆artificial
synthetic, fabricated, contrived, fake, mock, bogus, counterfeit, pseudo
☆conventional
traditional, historical, past; accepted, common, regular, routine, mainstream, ordinary
☆demand
request, claim, need, order, require, call for
☆decline
decrease, degeneration, drop, fall, recession, depression, reduction, slump, worsening
☆develop
evolve, advance, grow, improve, progress, flourish
☆difficulty
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