60> java A4_code
Mario starts task 0
Ariel starts task 1
Carlo starts task 3                     // Task #2 should come first!!!
                    Ariel ends task 1
                    Mario ends task 0
Beppe starts task 2                                    
Luigi starts task 0                     // Wrong order again!!!
                    Beppe ends task 2
Ariel starts task 1
Piera starts task 2
                    Carlo ends task 3
                    Luigi ends task 0
                    Ariel ends task 1
Carlo starts task 3
Mario starts task 0
                    Piera ends task 2
                    Carlo ends task 3
Ariel starts task 1
Beppe starts task 2
                    Mario ends task 0
                    Ariel ends task 1
Carlo starts task 3
Luigi starts task 0
Ariel starts task 1
                    Beppe ends task 2
Piera starts task 2
                    Luigi ends task 0
                    Piera ends task 2
                    Carlo ends task 3
Carlo starts task 3
Mario starts task 0
                    Ariel ends task 1
Ariel starts task 1
Beppe starts task 2
                    Ariel ends task 1
                    Carlo ends task 3
                    Mario ends task 0
                    Beppe ends task 2
Carlo starts task 3
Luigi starts task 0
Ariel starts task 1
Beppe starts task 2
                    Ariel ends task 1
                    Luigi ends task 0
                    Carlo ends task 3
                    Beppe ends task 2
Carlo starts task 3
Luigi starts task 0
                    Carlo ends task 3
^CAriel starts task 1
Piera starts task 2
                    Ariel ends task 1
                    Luigi ends task 0
Carlo starts task 3
Mario starts task 0
Ariel starts task 1
                    Piera ends task 2
Beppe starts task 2
^C
alonzo:~/www/assignments
59>