[amibroker] How to code this strategy ?

[pierre8rou]

Hello,

How to code this strategy ?

Strategy to backtest 

Be 8 days long. 
Then 5 days cash. 
Then 6 days short. 
Then 8 days cash. 

Repeat cycle. 
Be 8 days long. 
Then 5 days cash. 
Then 6 days short. 
Then 8 days cash. 

Repeat cycle. Etc..

Thanks,