=BUILTINS.R() -> {"RADIANS",RADIANS;"RAND",RAND;...}
DEFINE( BUILTINS.R, LAMBDA( VSTACK( HSTACK("RADIANS", RADIANS), HSTACK("RAND", RAND), HSTACK("RANDARRAY", RANDARRAY), HSTACK("RANDBETWEEN", RANDBETWEEN), HSTACK("RANK", RANK), HSTACK("RANK.AVG", RANK.AVG), HSTACK("RANK.EQ", RANK.EQ), HSTACK("RATE", RATE), HSTACK("RECEIVED", RECEIVED), HSTACK("REDUCE", REDUCE), HSTACK("REGEXEXTRACT", REGEXEXTRACT), HSTACK("REGEXREPLACE", REGEXREPLACE), HSTACK("REGEXTEST", REGEXTEST), HSTACK("REPLACE", REPLACE), HSTACK("REPLACEB", REPLACEB), HSTACK("REPT", REPT), HSTACK("RIGHT", RIGHT), HSTACK("RIGHTB", RIGHTB), HSTACK("ROMAN", ROMAN), HSTACK("ROUND", ROUND), HSTACK("ROUNDDOWN", ROUNDDOWN), HSTACK("ROUNDUP", ROUNDUP), HSTACK("ROW", ROW), HSTACK("ROWS", ROWS), HSTACK("RRI", RRI), HSTACK("RSQ", RSQ), HSTACK("RTD", RTD))))
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