var i=0,x=0,p=0,r=0,s="",m=s,t=" XO!":do:
i=instr(m,"!"):if i=0then read x,p,s:m="": _
while s[i]:r=s[i]-48:i+=1:m+=chr(t[3and(r\16)], _
t[3and(r\4)],t[3and(r)])+iif(((i)mod x),"",!"\n"): _
wend:r=p:s=m:x=x*3+1:if x=1then end
cls:?m:locate 1+p\x,1+p mod x,0:?"@
dim as byte k(7)={-1,1,0,0,0,0,x,-x}:
i=k(7and((getkey-97)\3)):var n=p+i,c=@m[n],d=@m[n+i]
if i then:select case*c\9:case 3:p=n:case 8,4
if*d=32then*d=*c:*c=32:p=n
if*d=33then*c=*d+(*c=79):*d=43:p=n
end select:else p=r:m=s:endif:loop
data 3,71,"5E041E41150=E5MB4MBTE@40ED0", _
4,29,"1EE010101810EDA0B010@IA@OP@@O00@EEE@