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.PS
# How about ladder diagrams?
gen_init
NeedDpicTools
{ for x=0 to 5 do { line up 5 from (x,0) } }
{ for y=0 to 5 do { line right 5 from (0,y) } }
posarray(A,
(1,0.5),
(4,0.5),
(4.5,1),
(4.5,3),
(4,3.5),
(3.5,3),
(3,2.5),
(1,2.5),
(0.5,3),
(0.5,4),
(1,4.5),
(4,4.5))
P[0]: 1,0.5
P[1]: 4.5,0.5
P[2]: 4.5,3.5
P[3]: 3.5,3.5
P[4]: 3.5,2.5
P[5]: 0.5,2.5
P[6]: 0.5,4.5
P[7]: 4,4.5
r = 0.4
define(`curve',
` move to P[0]
for i_c=1 to 6 do { arcto(P[i_c],P[i_c+1],r,`$1') }
line to P[7] `$1'')
lw = 0.3/(1bp__)
lt = 1.8
for i=0 to 6 do {
curve(thick lw-lt*i outlined rgbstring(0.1+i/10,0.1+i/10,0.1+i/10))}
.PE
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