trigger dependencies

[zigli]

Hi.

i have triggers like this

TVT link down {tvt-brand:tvt_ppp. sum( #3 ) }=0
Ping loss to ya.ru {tvt-brand:check_ping[ya.ru]. sum( #5 ) }=500
Ping loss to rbc {tvt-brand:check_ping[rbc.ru]. sum( #5 ) }=500
Ping loss to 217.66.29.1 {tvt-brand:check_ping[tvt]. sum( #5 ) }=500

also i configured standard action to send emails

How can i configure trigger dependencies so that "ping loss" trigger will not work then "TVT link down" triggers?

I do not want to get messages about "ping loss" then "TVT link down" trigger is on.