flatten-array: Add topics to resolve #827
flatten-array: Add topics to resolve #827


behrtam/xpython,pheanex/xpython,jmluy/xpython,exercism/python,N-Parsons/exercism-python,pheanex/xpython,exercism/xpython,smalley/python,N-Parsons/exercism-python,behrtam/xpython,jmluy/xpython,smalley/python,exercism/xpython,exercism/python