+ '1d' => 'daily',
+ '1w' => 'weekly',
+ '2w' => 'biweekly (every 2 weeks)',
+ '1' => 'monthly',
+ '2' => 'bimonthly (every 2 months)',
+ '3' => 'quarterly (every 3 months)',
+ '6' => 'semiannually (every 6 months)',
+ '12' => 'annually',
+ '24' => 'biannually (every 2 years)',