five_weekends:= proc()
	local i, month, count;
	#Only months with 31 days can possibly satisfy the condition
	local long_months := [1,3,5,7,8,10,12];
	local months := ["January","February","March","April","May","June","July","August","September","October","November","December"];
	count := 0;
	for i from 1900 to 2100 by 1 do
		for month in long_months do
			if Calendar:-DayOfWeek(Date(i, month, 1)) = 6 then
				printf("%d-%s\n", i, months[month]);
				count++;
			end if;
		end do;
	end do;
	printf("%d months have five full weekends.\n", count);
end proc;
five_weekends();