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SPC skips a specified number of spaces in a PRINT, LPRINT, or
PRINT # statement.
 
SPC(n%)
 
Usage Notes
    ■ Note that the SPC function does more than move the text cursor
      to a new print position. For screen output it also overwrites
      any existing characters on a display screen with blanks.
    ■ The n% blank characters are printed starting at the current
      print position.
    ■ The leftmost print position on an output line is always 1; to have
      any effect, the value of n% must be >= 1.
    ■ The rightmost print position is the current line width of the
      output device (which can be set with the WIDTH statement).
    ■ The behavior of a SPC function depends on the relationship between
      three values: n%, the output-line print position when the SPC
      function is executed, and the current output-line width:
        - If n% is greater than the output-line width, then SPC
          calculates
              (n% MOD width)
          and lays down that many blanks, starting at the current
          print position.
        - If the difference between the current print position and the
          output-line width is less than n% (or n% MOD width),
          then the SPC function skips to the beginning of the next line
          and lays down
                (n% - (width - current print position))
            blanks.