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KEY: Recess.
SYN: Cavity, nook, withdrawal, retirement, retreat, seclusion, privacy, vacation, holiday.
ANT: Promontory, protrusion, projection, publicity, worktime.
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KEY: Reciprocal.
SYN: Alternate, interchanged, mutual, Interchangeable, reflexive.
ANT: One-sided, unreciprocated, unreturned.
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KEY: Reciprocation.