case 1:
        @SuppressWarnings("unchecked") // safe; elements contains only E's
        // requireNonNull is safe because the first `n` elements are non-null.
        E elem = (E) requireNonNull(elements[0]);
        return of(elem);
      default:
        // continue below to handle the general case
    }
    int tableSize = chooseTableSize(n);
    Object[] table = new Object[tableSize];

        if (distinct == 0) {
          addDedupedElement(e);
          return this;
        } else {
          ensureTableCapacity(dedupedElements.length);
          E elem = dedupedElements[0];
          distinct--;
          return insertInHashTable(elem).add(e);
        }
      }
      return insertInHashTable(e);
    }

    private SetBuilderImpl<E> insertInHashTable(E e) {
      requireNonNull(hashTable);