code: def _context(self, context):
      out = []
      for item in context:
          coverage = self._coverage(item)
          if not isinstance(coverage, (tuple, list)):
              coverage = [coverage]
          out.extend(coverage)
      return out
  
imports: import logging
  import re
  from io import StringIO
  from fontTools.feaLib import ast
  from fontTools.ttLib import TTFont, TTLibError
  from fontTools.voltLib import ast
  from fontTools.voltLib.parser import Parser
label_desc: Use image node_id 11 for calling the VoltToFea obj's underlying member method code with example usage: obj._context(context) and returns: out