<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _get_part(pointlist, strokes):
 """Get some strokes of pointlist Parameters pointlist : list of lists of dicts strokes : list of integers Returns ------- list of lists of dicts """

    result = []
    strokes = sorted(strokes)
    for stroke_index in strokes:
        result.append(pointlist[stroke_index])
    return result