The lectionary is on a two year cycle. Select either "even or odd" depending on the current year. 

December (odd)-January (even)

February-March (even)

April-May (even)

June-July (even)

August-September (even)

October-November (even)

December (even)-January (odd)

Feb-March (odd)

April-May (odd)

June-July (odd)

August-September (odd)

October-November (odd)