Group (3) - Spelling Practices

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(1) (котел) large kettle or boiler of copper, brass, or iron
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(2) (спокойствие) freedom from motion, agitation, or disturbance; tranquility; stillness; quiet; serenity
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(3) (каустической) capable of burning, corroding, dissolving, or eating away by chemical action
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(4) (Чары) cautious; sparing or restrained about giving
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(5) (крючкотворства) mean or unfair artifice to obscure truth; deception by trickery or sophistry
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(6) (осмотрительнее) carefully aware of all circumstances; cautious
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(7) (разговорный) of informal spoken language or conversation; conversational or chatty
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(8) (горючих) capable of igniting and burning; easily aroused or excited
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(9) (скрыть) keep from being seen, found, observed, or discovered; secrete
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(10) (концентрических) having a common center, circles of different size, one within another