+----------------------------------+
   |todo    |dev     |coderev |done   |
   |        |max 3   |max 3   |       |
   +----------------------------------+
   |task 7  |task 4  |task 1  |       |
   |        |task 5  |task 2  |       |
   |        |task 6  |task 3  |       |
   +----------------------------------+