256 def form_by_call_order(symbol_lists):  argument
259   return uniq(s for symbols in symbol_lists for s in symbols)
261 def form_by_call_order_fair(symbol_lists):  argument
267   uniq_lists = [list(uniq(symbols)) for symbols in symbol_lists]
284     for symbols in symbol_lists
288 def form_by_frequency(symbol_lists):  argument
293   for symbols in symbol_lists:
301 def form_by_random(symbol_lists):  argument
303   merged_symbols = uniq(s for symbols in symbol_lists
308 def form_by_alphabetical(symbol_lists):  argument
310   merged_symbols = list(set(s for symbols in symbol_lists for s in symbols))
367   symbol_lists = []
370     symbol_lists.append([symbol for _,symbol in timestamped_symbols_list])
374   result = list(method(symbol_lists))