Coding issues with isolation of verbal morphology

['Harry Caulton' via chibolts]

I am attempting to isolate verbs by morphological type in the Brown corpus 
starting with the past tense. I have found that using:

freq +sm|*v - t*CHI +u *.CHA

It allows me to isolate verb stems and all morphological suffixes. However, 
when I change this code to:

freq +sm;*v,|-past - t*CHI +u *.CHA

I get 0 results. Which is confusing as I've added the marker for regular 
past tense morphology which should logically yield all regular past test 
verbs. I've reread the CLAN and MOR manuals but I cannot seem to find 
anything related to where to place the relevant information in the code.

Would anyone be able to assist me here? Many thanks in advance for your 
time.

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