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PowerShell 6, 244 254 bytes De Bruijn sequence is a good idea. Thanks to Level River St param($w,$h)for(;$z='A'..'Z'|?{"Z$x"-notmatch-join"$x$_"[-2..-1]}){$x+=''+$z[0]}$v=random 9 1..$h|%{$y=$_+$v ,(($r=1..$w)|%{"\ $($x[$y+$_-1]) /"})+,($r|%{$x[$_-1]+' X '+$x[$_]})+,($r|%{"/ $($x[$y+$_]) \"})|%{$_-join' | '} ,'-----'*$...


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