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------------> process usable: ** KEPT (pick-wt=6): 1 [] -tapaa(x,y)|tapaa(y,x). ** KEPT (pick-wt=7): 2 [] -tapaa(x,y)| -sairastaa(y)| tartuntavaarassa(x). ** KEPT (pick-wt=7): 3 [] -tapaa(x,y)| -tartuntavaarassa(y)| tartuntavaarassa(x). ** KEPT (pick-wt=4): 4 [] -tartuntavaarassa(a)| -tartuntavaarassa(b). ------------> process sos: ** KEPT (pick-wt=3): 5 [] tapaa(a,b). ** KEPT (pick-wt=3): 6 [] tapaa(a,c). ** KEPT (pick-wt=2): 7 [] sairastaa(c).

Length of proof is 3. Level of proof is 2. ---------------- PROOF ---------------1 [] -tapaa(x,y)|tapaa(y,x). 2 [] -tapaa(x,y)| -sairastaa(y)|tartuntavaarassa(x). 3 [] -tapaa(x,y)| -tartuntavaarassa(y)|tartuntavaarassa(x). 4 [] -tartuntavaarassa(a)| -tartuntavaarassa(b). 5 [] tapaa(a,b). 6 [] tapaa(a,c). 7 [] sairastaa(c). 8 [hyper,5,1] tapaa(b,a). 9 [hyper,6,2,7] tartuntavaarassa(a). 11 [hyper,8,3,9] tartuntavaarassa(b). 13 [hyper,11,4,9] $F. ------------ end of proof -------------

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