=BUILTINS.H() -> {"HARMEAN",HARMEAN;"HEX2BIN",HEX2BIN;...}
DEFINE( BUILTINS.H, LAMBDA( VSTACK( HSTACK("HARMEAN", HARMEAN), HSTACK("HEX2BIN", HEX2BIN), HSTACK("HEX2DEC", HEX2DEC), HSTACK("HEX2OCT", HEX2OCT), HSTACK("HLOOKUP", HLOOKUP), HSTACK("HOUR", HOUR), HSTACK("HSTACK", HSTACK), HSTACK("HYPERLINK", HYPERLINK), HSTACK("HYPGEOM.DIST", HYPGEOM.DIST), HSTACK("HYPGEOMDIST", HYPGEOMDIST))))
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