Cronjob linux every X scond

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***** ( /usr/bin/wget http://api.us/application/ )  
***** ( sleep 10 ; /usr/bin/wget http://api.us/application/ )  
***** ( sleep 20 ; /usr/bin/wget http://api.us/application/ )  
***** ( sleep 30 ; /usr/bin/wget http://api.us/application/ )  
***** ( sleep 40 ; /usr/bin/wget http://api.us/application/ )  
***** ( sleep 50 ; /usr/bin/wget http://api.us/application/ )  

_https://stackoverflow.com/questions/30295868/how-to-setup-cron-job-to-run-every-10-seconds-in-linux