2 <b:box xmlns:m="http://www.w3.org/1998/Math/MathML" xmlns:b="http://helm.cs.unibo.it/2003/BoxML">
6 <b:space height="2ex"/>
9 <b:space width="1ex" height="1ex"/>
11 <b:space height="1ex"/>
12 <b:text>This goal has already been closed.</b:text>
13 <b:text>Use the "skip" command to throw it away.</b:text>