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MATH PUZZLE: Can you replace the question mark with a number?
Background picture associated with the solution.
Remove 6 letters from this sequence (ATOIMLOROROEPW) to reveal a familiar English word.

Rotary disk plow

In 1896, Clement Hardy was issued a patent for the rotary disk plow (No. 556,972). His patent described a rotary-disk plow constructed with one or more plowing disks arranged diagonally to the line of draft and suitable supported by furrow and landside wheels and a suitable metal or wooden frame. The plow disks were designed to be drawn into the earth by their own action and by the weight of the soil lifted by the disks and carried on their faces and have a cutting action on the bottom of the furrow instead of scraping, thereby enabling much reduction of the machinery's weight that had previously been thought necessary in this class of plows in order to force the disks into the soil and hold them to their work.[Image: top view, showing seat to left of rear wheel.]

Charged For Speeding

A man was speeding down a Alabama highway, feeling secure in a gaggle of cars all traveling at the same speed. However, as they passed a speed trap, he got nailed with an infrared speed detector and was pulled over.
The officer handed him the citation, received his signature and was about to walk away when the man asked, "Officer, I know I was speeding, but I don't think it's fair - there were plenty of other cars around me who were going just as fast, so why did I get the ticket?"
"Ever go a fishin'?" the policeman suddenly asked the man.
"Ummm, yeah..." the startled man replied.
The officer grinned and added, "Did you ever catch 'em all?"
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