\setlength{\unitlength}{0.01cm} \nop{ } \nop{ } \begin{picture}(784,625)(0,125) \small \bezier{100}(214,615)(214,615)(122,510) \bezier{100}(234,615)(234,615)(326,510) \bezier{100}(326,490)(326,490)(234,385) \bezier{100}(346,490)(346,490)(438,385) \bezier{100}(438,365)(438,365)(346,260) \bezier{100}(458,365)(458,365)(550,260) \put(224,625){ . \makebox(0,0)[l]{ <- number(X) } } \put(112,490){ \makebox(0,0)[t]{ [] } } \put(336,500){ . \makebox(0,0)[l]{ <- number(s(X1)) } } \put(224,365){ \makebox(0,0)[t]{ [] } } \put(448,375){ . \makebox(0,0)[l]{ <- number(s(s(X2))) } } \put(336,240){ \makebox(0,0)[t]{ [] } } \put(560,250){ . \makebox(0,0)[l]{ <- number(s(s(s(X3)))) } } \put(158,562){\makebox(0,0)[r]{ \footnotesize {X/0} } } \put(290,562){\makebox(0,0)[l]{ \footnotesize {X/s(X1)} } } \put(270,437){\makebox(0,0)[r]{ \footnotesize {X1/0} } } \put(402,437){\makebox(0,0)[l]{ \footnotesize {X1/s(X2)} } } \put(382,312){\makebox(0,0)[r]{ \footnotesize { X2 /0} } } \put(514,312){\makebox(0,0)[l]{ \footnotesize { X2 /s(X3)} } } \end{picture}