alphametics: improve test ordering
alphametics: improve test ordering

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