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+digraph G {

+ a [shape=box]

+ b [shape=polygon]

+ c [shape=ellipse]

+ d [shape=circle]

+ e [shape=point]

+ f [shape=egg]

+ g [shape=triangle]

+ h [shape=plaintext]

+ i [shape=diamond]

+ j [shape=trapezium]

+ k [shape=parallelogram]

+ l [shape=house]

+ m [shape=pentagon]

+ n [shape=hexagon]

+ o [shape=septagon]

+ p [shape=octagon]

+ q [shape=doublecircle]

+ r [shape=doubleoctagon]

+ s [shape=tripleoctagon]

+ t [shape=invtriangle]

+ u [shape=invtrapezium]

+ v [shape=invhouse]

+ w [shape=Mdiamond]

+ x [shape=Msquare]

+ y [shape=Mcircle]

+ z [shape=rect]

+ 1 [shape=rectangle]

+ 2 [shape=none]

+ 3 [shape=note]

+ 4 [shape=tab]

+ 5 [shape=box3d]

+ 6 [shape=component]

+ 7 [shape=folder]

+ a  -> b  -> c  -> d  -> e  -> f  -> g

+ h  -> i  -> j  -> k  -> l  -> m  -> n

+ o  -> p  -> q  -> r  -> s  -> t  -> u

+ v  -> w  -> x  -> y  -> z  -> 1  -> 2

+ 3  -> 4  -> 5  -> 6  -> 7

+}