question: What procedures cost less than 5000 and have John Wen as a trained physician?
#1 return procedures 
#2 return costs of #1 
#3 return #1 where #2 is  lower than 5000 
#4 return physicians trained in #1 
#5 return #1 where #2 is  John Wen 
#6 return #1 of both #3 and #5