| "ts","dur","part","a","b" | |
| 0,100,0,"[NULL]",111 | |
| 100,200,0,"[NULL]",222 | |
| 0,50,1,"[NULL]",333 | |
| 50,50,1,"[NULL]",444 | |
| 100,150,1,111,444 | |
| 250,50,1,111,"[NULL]" | |
| 300,100,1,111,555 | |
| 400,100,1,111,666 | |
| 500,50,1,222,666 | |
| 550,50,1,"[NULL]",666 | |
| 600,50,1,333,666 | |
| 650,50,1,333,"[NULL]" | |
| 100,1000,2,"[NULL]",777 | |
| 500,100,3,444,"[NULL]" | |
| 50,50,4,"[NULL]",888 | |
| 100,100,4,555,"[NULL]" | |
| 200,50,4,666,999 | |
| 250,50,4,777,"[NULL]" | |
| 100,25,5,888,"[NULL]" | |
| 125,50,5,888,1111 | |
| 175,15,5,888,"[NULL]" | |
| 190,10,5,888,2222 | |
| 200,10,5,"[NULL]",2222 |