def METHOD_NAME(alphabet_symbols, symbols):
    """
    'LetterAlphabet' handles different input iterable types in different
    ways.
    Assert that all ways work.
    """
    alph = seq.LetterAlphabet(alphabet_symbols)
    code = alph.encode_multiple(symbols)
    conv_symbols = alph.decode_multiple(code)
    if isinstance(symbols, bytes):
        symbols = symbols.decode("ASCII")
    assert list(conv_symbols) == list(
        [symbol.decode("ASCII") if isinstance(symbol, bytes) else symbol
         for symbol in symbols]
    )