As with most algorithms, there are trade-offs :). An advantage of the poem is that it can be learned by small children. I disagree that your approach can't be m

As with most algorithms, there are trade-offs :). An advantage of the poem is that it can be learned by small children. I disagree that your approach can't be mixed up... I'm still trying to figure out what nomth is so I can implement it ;) I certainly wouldn't recommend my usual approach though: alternate 31/"not 31" starting from October (Halloween is the 31st) or March (my birthday is close enough to the end of the month for me to remember that March has 31 days.)