[amibroker] help with 'AND"

[mdkumarz]

Dear Sir,
       I somehow messed up with this simple logic. 
Buy: if Close> Parabolic SAR in 30 min then 
     if close> parabolic SAR in 10 min 
SELL:if Close< Parabolic SAR in 30 min then 
     if close< parabolic SAR in 10 min
The AFL code follows:

TimeFrameSet(in1Minute * 30);
A=SAR(0.02,0.2);
Cond1=C>SAR(0.02,0.2);
Cond2=C<SAR(0.02,0.2);
TimeFrameRestore();
K = TimeFrameExpand(A, in1Minute * 30);
Cond3=C>SAR(0.02,0.2);
Cond4=C<SAR(0.02,0.2);
Plot(K, "K", colorRed, styleDots );
Buy=Cond1 AND Cond3;
Sell=Cond2 AND Cond4;
Buy=ExRem(Buy,Sell);
Sell=ExRem(Sell,Buy);

Regards,
M D KUMAR