Trvkt0r John Deere 8310R, Ukraine

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During the classes on PCH, the instructor wrote a formula on the blackboard. Then he
returned to the class and, calling the name of the pensive cadet, asked a question:(//tractor-service.com)
- What is this formula, cadet Smith?
- It's... it's... You see, sir, it's on the tip of your tongue, but don't remember it.
I can, - the cadet began to wriggle out.
- In that case, - said the instructor, - you better spit. This is Lewisite.