\set months {Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec}
\set days {31 28 31 30 31 30 31 31 30 31 30 31}
Number of months:
\set months {Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec}
\set days {31 28 31 30 31 30 31 31 30 31 30 31}
Number of months: