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9 points
ALTERNATE is validvalid
to act or proceed by turns [v ALTERNATED, ALTERNATES, ALTERNATING] : ALTERNATELY [adv], ALTERNATINGLY [adv], ALTERNATION [n], ALTERNATOR [n]
in turns [adj ALTERNATELY] / to cause to follow by turns or one after the other (properly, of two things) [v ALTERNATED, ALTERNATING, ALTERNATES]