[amibroker] HHV and LLV of 10,20 and 30 days - Breakout AFL help

[infynhome]

Hello,

I need to backtest the following system:

Buy when price moves above HHV of the last 10 trading sessions.
Sell when price move below the HHV of the last 10 trading sessions.

Regards
Mithil Pradhan