Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_73 (month VARCHAR, _year VARCHAR, sunk_by_aircraft VARCHAR, sunk_by_warship_or_raider VARCHAR)

### Question ###
What is the month and year less than 106005 were sunk by aircraft and 61857 were sunk by warship or raider?

### Accurate SQL ###

SELECT month, _year FROM table_name_73 WHERE sunk_by_aircraft < 106005 AND sunk_by_warship_or_raider = 61857