R help - Sep 2012 - arima forecast without the first order of auto-regressor

Hi, I want to predict using airma, but I want to predict using t-2 or t-3,
instead of t-1
right now the arima() function doesn't allow me to do that, it will alwasy
return with variable t-1 , 
what is the way to skip that variable?
thanks &regards



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