; Has intertwined production rules (T1 and T2), and produces ; a mandala of triangles, where the most important parameter is the ; maximum substitution level, given on the command line, with a ; higher number making longer mandala arms. ; nell manda13.nll PIC2 7 | nellsvg 65 65 mm 0.2 1 > manda13.svg n2 = 10; a = 2*pi/n2; l1 = 8; l2 = 13; l3 = 13; k1 = 5; k2 = 8; k3 = 8; a1 = angle(l3,l1,l2); a2 = angle(l1,l2,l3); a3 = angle(l2,l3,l1); b1 = angle(k3,k1,k2); b2 = angle(k1,k2,k3); b3 = angle(k2,k3,k1); T1 : L(l1) T(pi-a2) S(T2,1) L(l2) T(pi-a3) L(l3) T(pi-a1); T2 : L(k1) T(b2-pi) S(T1,1) L(k2) T(b3-pi) L(k3) T(b1-pi); PIC1 : [S(T1,1)] T(a); PIC2 : P(32,32) S(PIC1,n2);