Function parallel

test/utils/cause.ts:32–36

(n: number)

  }

  const parallel = (n: number): fc.Arbitrary<Cause.Cause<E>> => {
    return fc.integer({ min: 1, max: n - 1 }).chain((i) =>
      causesN(i).chain((left) => causesN(n - i).map((right) => Cause.parallel(left, right)))
    )
  }

  const causesN = (n: number): fc.Arbitrary<Cause.Cause<E>> => {
    if (n === 1) {