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export function on(  binaryFn, unaryFn, a, b){  if (arguments.length === 3){    return _b => on(      binaryFn, unaryFn, a, _b    )  }  if (arguments.length === 2){    return (_a, _b) => on(      binaryFn, unaryFn, _a, _b    )  }
  return binaryFn(unaryFn(a), unaryFn(b))}