Problem: U5-N5-L4
Solution:
 Bag1: U5
  -- 03 03 -- 
  01 01 03 -- 
  01 03 03 -- 
  01 01 -- -- 
  00 00 00 -- 
  00 02 00 02 
  -- 02 02 02 
 Bag2: N5
  -- 01 05 -- 
  01 01 05 -- 
  01 05 05 -- 
  01 05 -- -- 
  04 04 04 -- 
  00 00 04 04 
  -- 00 00 00 
 Bag3: L4
  -- 07 07 -- 
  01 01 07 -- 
  01 06 07 -- 
  01 06 -- -- 
  00 06 06 -- 
  00 00 00 02 
  -- 02 02 02 
#squares: 20
#pieces:
 Bag1: 4
 Bag2: 4
 Bag3: 5
CPU Time: 337.002s
Optimum: yes
Board Size: 30x30
Threads: 16
Choices: 11517946
Conflicts: 6175566
Restarts: 4499
Variables: 57803
Constraints: 192312