The rats worried about about the stuff that they stole it. Justin opened the doors of the rats cages and Jonathon was with them . They followed Justin because he knew the way . The air duct suddenly started to work and 6 mice were too light and they missed. The white mice gave them the idea about how to open screen . And they followed his structures . After that they were standing on the roof of NIMH free. The sound of 
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machine grown suddenly louder. The air blowing past Justin and he held on, he was lucky. Justin reach apoint by seeing the light from sky. They don’t know it would take them to break the screen. They are afraid that Dr. Schultz might figure out how they gone, and if he knows he will trap them in the air shaft. They spent one more day in the laboratory and they left the next night. Jonathan heard Nicadimous that they are going out and he asked him that he would like to go too. Jenner realize that they must learn to read.