classification question

hi all

I want to ask a question about classification algorthims in rapid miner 

the qustion is :
can I put 2 classification operators one follow each other eg: knn->NB  or  logistic regrission -> NB is that possible in rapid miner if it yes I want an explaintion for this if not I want to know how to do this in any other way this is important to me because I want it to my master thesis in opinion mining

please answer me

thank you