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function flipFn(fn){  return (...input) => {    if (input.length === 1){      return holder => fn(holder, input[ 0 ])    } else if (input.length === 2){      return fn(input[ 1 ], input[ 0 ])    } else if (input.length === 3){      return fn(        input[ 1 ], input[ 0 ], input[ 2 ]      )    } else if (input.length === 4){      return fn(        input[ 1 ], input[ 0 ], input[ 2 ], input[ 3 ]      )    }
    throw new Error('R.flip doesn\'t work with arity > 4')  }}
export function flip(fn){  return flipFn(fn)}