Heater Hose Replacement

["kenndeal" <kenndeal@xxxx>]

Anyone know which side of the heater core is feed and return? I 
just did all the water hoses but I forgot to label the pipes that 
supply the heater. I know it will work either way but I still 
remember my high school auto shop teacher saying they should 
not be reversed as lodged debris could back flush into the 
system.