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medii ^ [[insertion]] quatuor [[/insertion]] faciunt rursus octonarium. Qui cum superioribus iuncti, xvi tetragonum pandunt. [[image: decorative red box with six boxed circles arranged in two rows; each circle is labelled below and is divided into two semicircles with a bar between]] [[top label]] v xii tetragonum pandunt. xxv [[/label]] [[circle one]] [[upper semicircle]] iiii [[/upper semicircle]] [[bar]] i .ii. iiii. [[/bar]] [[lower semicircle]] viiii [[/lower semicircle]] [[label]] Tetragonus atribus [[/label]] [[/circle one]] [[circle two]] [[upper semicircle]] xii [[/upper semicircle]] [[bar]] iiii .vi. viiii [[/bar]] [[lower semicircle]] xxv [[/lower semicircle]] [[label]] Tetragonus aquinque [[/label]] [[/circle two]] [[circle three]] [[upper semicircle]] xxiiii [[/upper semicircle]] [[bar]] ii .xii. xvi. [[/bar]] [[lower semicircle]] xlviiii [[/lower semicircle]] [[label]] Tetragonus aseptem [[/label]] [[/circle three]] [[circle four]] viii [[upper semicircle]] viii [[/upper semicircle]] [[bar]] ii .iiii. vi. [[/bar]] [[label]] Tetragonus a iiii [[/label]] [[/circle four]] [[circle five]] xviii [[upper semicircle]] xviii [[/upper semicircle]] [[bar]] vi .viiii. xii. [[/bar]] [[lower semicircle]] xxxvi [[/lower semicircle]] [[label]] Tetragonus a vi [[/label]] [[/circle five]] [[circle six]] xxxii [[upper semicircle]] xxxii [[/upper semicircle]] [[bar]] xii .xvi. xx. [[/bar]] [[lower semicircle]] Lxiiii [[/lower semicircle]] [[label]] Tetragonus a viii [[/label]] [[/circle six]] [[/image]] [[large blue capital I with red penwork]]llud quoque non oportet minore admiratione suscipere, quod secundum proprias naturas ubi altrinsecus duo tetragoni constant et unus parte altera longior in medio ponitur, tetragonus qui nascitur ille, semper ab impari procreatur. Nam ex superioribus uno et .iiii. et bis multiplicato binario, factus est nouenarius tetragonus qui scilicet a tribus procreatur, ter enim tres, nouenarium faciunt, qui ternarius impar est numerus. Et sequens qui ex .iiii [[superscript]] or [[/superscript]]. et .ix. et bis multiplicato senario coniunctus est .xxv tetragonus et ipse ex impari quinario nascitur et continenti post ternarium quinquies enim qunique .xxv. producunt, et quinarius post ternarium impar numerus est. In sequenti quoque eadem ratio est. Nam qui ex nouem et xvi. et bis ducto .xii. quadratus .xlix. producitur, a septenario impare fit.