code: def dedent(line):
      
      indentation = 0
      for char in line:
          if char not in ' \t':
              break
          indentation += 1
          if char == '\t':
              indentation = _round8(indentation)
  
      if indentation % 8 != 0:
          raise IndentError(column=indentation)
  
      return indentation // 8, line.strip()
docs: Banana banana