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only the spaceband key and the left column of keys with their left hand and all the remaining keys with their right hand.

In case of an error, the operator would often run his fingers down the first two columns, thus filling out the line with the nonsense words etaoin shrdlu, in what is known as a "run down". It is often quicker to cast a bad slug than to hand-correct the line within the assembler. The slug with the run down is removed once it has been cast, or by the proofreader.

The keys

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