remind tarin and bob to leave at 16:00; alert 20 minutes prior to leave time
[IN:CREATE_REMINDER remind [SL:PERSON_REMINDED tarin ] and [SL:PERSON_REMINDED bob ] to [SL:TODO [IN:GET_TODO [SL:TODO leave ] [SL:DATE_TIME at 16 : 00 ] ] ] ; alert [SL:DATE_TIME 20 minutes prior ] to leave time ]