Before revision: upright=1.5|The WDR paper computer adding the numbers 4 and 5 The WDR paper computer or Know-how Computer is a "computer" that can be easily assembled from a sheet of paper and individual matches.
After revision: upright=1.2|Pen-and-matchsticks version of the paper computer during the first step of the addition program shown aboveupright=1.5|The WDR paper computer adding the numbers 4 and 5 The WDR paper computer or Know-how Computer is a "computer" that can be easily assembled from a sheet of paper and individual matches.