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verbatimtex
.EQ
delim $$
.EN
\# etex
prologues := 2;
input boxes
beginfig(1);
pair shadowshift;
shadowshift = (1, -1) * bp;
def drawshadowed(text t) =
forsuffixes $ = t:
fill bpath$ shifted shadowshift;
unfill bpath$;
drawboxed($);
endfor
enddef;
boxit.a(btex \[12] \s8A\s+2 \[lh] a etex);
circleit.b(btex $e sup {i omega t}$ etex rotated 20);
b.w - a.e = (10bp, 0);
drawshadowed(a, b);
draw a.e .. b.w;
label.top(btex \[Cs] \[Po] \[Eu] etex, a.n);
label.llft(btex \[Fn] etex, a.s);
draw bbox currentpicture dashed evenly;
endfig;
end
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