The DELETE statement deletes the TENSION data set and the A2 catalog. MT=CATALOG only applies to A2 and is necessary because the default member type for the DELETE statement is DATA. The CHANGE statement changes the name of the A1 catalog to POSTDRUG. The EXCHANGE statement exchanges the names of the WEIGHT and BODYFAT data sets. MEMTYPE= is not necessary in the CHANGE or EXCHANGE statement because the default is MEMTYPE=ALL for each statement.
   delete tension a2(mt=catalog);
   change a1=postdrug;
   exchange weight=bodyfat;