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_41513 ( "Nation" text, "Skip" text, "Ends Won" real, "Ends Lost" real, "Blank Ends" real, "Stolen Ends" real, "Shot Pct." text )

### Question ###
What is the sum of Blank Ends for Denmark when less than 42 is the ends lost?

### Accurate SQL ###

SELECT SUM("Blank Ends") FROM table_41513 WHERE "Nation" = 'denmark' AND "Ends Lost" < '42'