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/usr/lib/open-axiom/input/folium.input is in open-axiom-test 1.4.1+svn~2626-2ubuntu2.

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-- @(#)folium.input	1.1    89/09/07  20:54:58
draw(curve((t**2-1)/(3*t**2+1),t*(t**2-1)/(3*t**2+1)),t = -3..3, [title "Folium of Descartes"])