8.11

4 lines

                        c
                    +-------+
                    |    "hello"
                    |    
                c   |   p
            +-------+-------+
            |     fork   "hello"
            |
            |           c
            |       +-------+
            |       |    "hello"
            |       |    
            |   p   |   p    
     +------+-------+-------+
    main  fork    fork   "hello"