MAYBE

Problem:
 cond1(true(),x,y) -> cond2(gr(x,y),x,y)
 cond2(true(),x,y) -> cond1(gr0(x),y,y)
 cond2(false(),x,y) -> cond1(gr0(x),p(x),y)
 gr(0(),x) -> false()
 gr(s(x),0()) -> true()
 gr(s(x),s(y)) -> gr(x,y)
 gr0(0()) -> false()
 gr0(s(x)) -> true()
 p(0()) -> 0()
 p(s(x)) -> x

Proof:
 DP Processor:
  DPs:
   cond1#(true(),x,y) -> gr#(x,y)
   cond1#(true(),x,y) -> cond2#(gr(x,y),x,y)
   cond2#(true(),x,y) -> gr0#(x)
   cond2#(true(),x,y) -> cond1#(gr0(x),y,y)
   cond2#(false(),x,y) -> p#(x)
   cond2#(false(),x,y) -> gr0#(x)
   cond2#(false(),x,y) -> cond1#(gr0(x),p(x),y)
   gr#(s(x),s(y)) -> gr#(x,y)
  TRS:
   cond1(true(),x,y) -> cond2(gr(x,y),x,y)
   cond2(true(),x,y) -> cond1(gr0(x),y,y)
   cond2(false(),x,y) -> cond1(gr0(x),p(x),y)
   gr(0(),x) -> false()
   gr(s(x),0()) -> true()
   gr(s(x),s(y)) -> gr(x,y)
   gr0(0()) -> false()
   gr0(s(x)) -> true()
   p(0()) -> 0()
   p(s(x)) -> x
  TDG Processor:
   DPs:
    cond1#(true(),x,y) -> gr#(x,y)
    cond1#(true(),x,y) -> cond2#(gr(x,y),x,y)
    cond2#(true(),x,y) -> gr0#(x)
    cond2#(true(),x,y) -> cond1#(gr0(x),y,y)
    cond2#(false(),x,y) -> p#(x)
    cond2#(false(),x,y) -> gr0#(x)
    cond2#(false(),x,y) -> cond1#(gr0(x),p(x),y)
    gr#(s(x),s(y)) -> gr#(x,y)
   TRS:
    cond1(true(),x,y) -> cond2(gr(x,y),x,y)
    cond2(true(),x,y) -> cond1(gr0(x),y,y)
    cond2(false(),x,y) -> cond1(gr0(x),p(x),y)
    gr(0(),x) -> false()
    gr(s(x),0()) -> true()
    gr(s(x),s(y)) -> gr(x,y)
    gr0(0()) -> false()
    gr0(s(x)) -> true()
    p(0()) -> 0()
    p(s(x)) -> x
   graph:
    cond2#(false(),x,y) -> cond1#(gr0(x),p(x),y) ->
    cond1#(true(),x,y) -> cond2#(gr(x,y),x,y)
    cond2#(false(),x,y) -> cond1#(gr0(x),p(x),y) ->
    cond1#(true(),x,y) -> gr#(x,y)
    cond2#(true(),x,y) -> cond1#(gr0(x),y,y) ->
    cond1#(true(),x,y) -> cond2#(gr(x,y),x,y)
    cond2#(true(),x,y) -> cond1#(gr0(x),y,y) ->
    cond1#(true(),x,y) -> gr#(x,y)
    gr#(s(x),s(y)) -> gr#(x,y) ->
    gr#(s(x),s(y)) -> gr#(x,y)
    cond1#(true(),x,y) -> cond2#(gr(x,y),x,y) ->
    cond2#(false(),x,y) -> cond1#(gr0(x),p(x),y)
    cond1#(true(),x,y) -> cond2#(gr(x,y),x,y) ->
    cond2#(false(),x,y) -> gr0#(x)
    cond1#(true(),x,y) -> cond2#(gr(x,y),x,y) ->
    cond2#(false(),x,y) -> p#(x)
    cond1#(true(),x,y) -> cond2#(gr(x,y),x,y) ->
    cond2#(true(),x,y) -> cond1#(gr0(x),y,y)
    cond1#(true(),x,y) -> cond2#(gr(x,y),x,y) ->
    cond2#(true(),x,y) -> gr0#(x)
    cond1#(true(),x,y) -> gr#(x,y) -> gr#(s(x),s(y)) -> gr#(x,y)
   SCC Processor:
    #sccs: 2
    #rules: 4
    #arcs: 11/64
    DPs:
     cond2#(false(),x,y) -> cond1#(gr0(x),p(x),y)
     cond1#(true(),x,y) -> cond2#(gr(x,y),x,y)
     cond2#(true(),x,y) -> cond1#(gr0(x),y,y)
    TRS:
     cond1(true(),x,y) -> cond2(gr(x,y),x,y)
     cond2(true(),x,y) -> cond1(gr0(x),y,y)
     cond2(false(),x,y) -> cond1(gr0(x),p(x),y)
     gr(0(),x) -> false()
     gr(s(x),0()) -> true()
     gr(s(x),s(y)) -> gr(x,y)
     gr0(0()) -> false()
     gr0(s(x)) -> true()
     p(0()) -> 0()
     p(s(x)) -> x
    Open
    
    DPs:
     gr#(s(x),s(y)) -> gr#(x,y)
    TRS:
     cond1(true(),x,y) -> cond2(gr(x,y),x,y)
     cond2(true(),x,y) -> cond1(gr0(x),y,y)
     cond2(false(),x,y) -> cond1(gr0(x),p(x),y)
     gr(0(),x) -> false()
     gr(s(x),0()) -> true()
     gr(s(x),s(y)) -> gr(x,y)
     gr0(0()) -> false()
     gr0(s(x)) -> true()
     p(0()) -> 0()
     p(s(x)) -> x
    Subterm Criterion Processor:
     simple projection:
      pi(gr#) = 1
     problem:
      DPs:
       
      TRS:
       cond1(true(),x,y) -> cond2(gr(x,y),x,y)
       cond2(true(),x,y) -> cond1(gr0(x),y,y)
       cond2(false(),x,y) -> cond1(gr0(x),p(x),y)
       gr(0(),x) -> false()
       gr(s(x),0()) -> true()
       gr(s(x),s(y)) -> gr(x,y)
       gr0(0()) -> false()
       gr0(s(x)) -> true()
       p(0()) -> 0()
       p(s(x)) -> x
     Qed