Fractal trees with L-system

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Birch


fig17 (15K)
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FFA
A=[&B]>(180)FcA
B=F'(.8)B
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fig18 (14K)
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FFFFFA
A=[&B]>(100)FF[&B]>(110)FF[&B]>(110)FFc!'A
B=F+[F~(20)F'(.8)tB]-[F~(20)F'(.8)tB]
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fig19 (10K)
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c(8)FFFFFA!AA!A!AB
A=[&BL]>(100)F[&BL]>(110)F[&BL]>(110)'F
B=!![F~(30)t(.7)BL][!F~(30)t(.7)BL]??
w=~(100)f(200){-f(15)+f(15)+f(15)-|-f(15)+f(15)}
L=c(1)[w][w][w]z[w][w]L
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fig20 (20K)