new
gr 20 20
m e
gen arc 10,7 17,7 180
mark j=8 i=4,18
mod null reg 10,10
struc cable begin grid 7,14 end grid 2,20 prop=1
struc cable begin grid 11,15 end grid 11,20 prop=1
struc cable begin grid 7,14 end grid 20,20 prop=1 ;niedokonczone


plot hold cable grid
plot hold struct axial fill
plot hold strct sdfsp fill