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 perpetrator ( perpetrator_id number, people_id number, date text, year number, location text, country text, killed number, injured number )
TABLE: CREATE TABLE people ( people_id number, name text, height number, weight number, home town text )

### Question ###
Show the countries that have both perpetrators with injures more than 50 and perpetrators with injures smaller than 20.

### Accurate SQL ###

SELECT country FROM perpetrator WHERE injured > 50 INTERSECT SELECT country FROM perpetrator WHERE injured < 20