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The site shalla.net states the following, "For Microsoft Excel, version 97 or later." I noticed that the webpage also stated " STAIR STRINGER DESIGN CALCULATOR - PROFESSIONAL." They also stated " If youve ever cut a stair stringer you know what a pain it is. There are multiple measurements and dimensions to consider. Its not really all that complicated, its just a pain. And if you decide you want to change the number of treads in your design you have to calculate everything all over again. To design your stringers, just type in your measurements." The meta header had Other as the first keyword. This keyword was followed by keyword2, stair stringer, and staircase design which isn't as important as Other. The other words the site used was build a staircase. how to build stairs is also included but might not be seen by search crawlers.