32. Unwanted spaces
    ~~~~~~~~~~~~~~~
It is all too easy to leave unwanted spaces in listings, especially by
"overshooting" the ends of lines when using the <Copy> key. If you are short
of memory, it is worthwhile editing out those spaces.

You can spot them by redefining them as white blobs, and then using any Mode
except 7, (6 is ideal). When you wish to remove spaces, type the following
in directly in Mode 7, and then change mode. When you've edited out any
unwanted spaces, change back to Mode 7 and SAVE the program. To restore
normal spaces, type *FX20 <Return>.

 VDU23,32,126,126,126,126,126,126,126,0