I think the procedure to switch to solid walls lies
here.
However, I'm not an expert on the subject since I prefer '#' for walls
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A(3.2.0) C "
Angdiira II" DP L:36 DL:44(2200') A+ R+ Sp w:Whip of Westernesse(+10,+10)(+2)
A Mx H- D c-- f- PV+ s- d P++ M+
C- S-- I So B++ ac GHB- SQ+ RQ++ V+