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![Every Maker Should Have [Pt.40]...an HP-15C, HP-35S or a Casio fx-61F - YouTube](https://i.ytimg.com/vi/6wlNZ_KYQUQ/maxresdefault.jpg "Every Maker Should Have [Pt.40]...an HP-15C, HP-35S or a Casio fx-61F - YouTube")
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