<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def split_lines(lines):
 """ split a MagIC upload format file into lists. """

    container = []
    new_list = []
    for line in lines:
        if '>>>' in line:
            container.append(new_list)
            new_list = []
        else:
            new_list.append(line)
    container.append(new_list)
    return container