In 2001, where the mens singles is armand jehle and the womens singles is michaela ritter, who are the mixed doubles
create table table_15001681_1 (mixed_doubles varchar, womens_singles varchar, mens_singles varchar, PRIMARY KEY (mixed_doubles))
select mixed_doubles from table_15001681_1 where womens_singles = "michaela ritter" and mens_singles = "armand jehle"