proc analogous(c: Color; results: int = 6; slices: int = 30): seq[Color] {.
    ...raises: [], tags: [], forbids: [].}

proc complementSeq(c: Color): seq[Color] {....raises: [], tags: [], forbids: [].}

proc monochromatic(c: Color; results: int = 6): seq[Color] {....raises: [],
    tags: [], forbids: [].}

proc splitComplement(c: Color): seq[Color] {....raises: [], tags: [], forbids: [].}

proc tetrad(c: Color): seq[Color] {....raises: [], tags: [], forbids: [].}

proc triad(c: Color): seq[Color] {....raises: [], tags: [], forbids: [].}