0.002/0.002 NO 0.002/0.002 0.002/0.002 Problem 1: 0.002/0.002 0.002/0.002 0.002/0.002 ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 0.002/0.002 Confluence Problem: 0.002/0.002 (VAR vNonEmpty:S N:S X:S XS:S Y:S YS:S) 0.002/0.002 (STRATEGY CONTEXTSENSITIVE 0.002/0.002 (from 1) 0.002/0.002 (minus 1 2) 0.002/0.002 (quot 1 2) 0.002/0.002 (sel 1 2) 0.002/0.002 (zWquot 1 2) 0.002/0.002 (0) 0.002/0.002 (cons 1) 0.002/0.002 (fSNonEmpty) 0.002/0.002 (nil) 0.002/0.002 (s 1) 0.002/0.002 ) 0.002/0.002 (RULES 0.002/0.002 from(X:S) -> cons(X:S,from(s(X:S))) 0.002/0.002 minus(s(X:S),s(Y:S)) -> minus(X:S,Y:S) 0.002/0.002 minus(X:S,0) -> 0 0.002/0.002 quot(0,s(Y:S)) -> 0 0.002/0.002 quot(s(X:S),s(Y:S)) -> s(quot(minus(X:S,Y:S),s(Y:S))) 0.002/0.002 sel(0,cons(X:S,XS:S)) -> X:S 0.002/0.002 sel(s(N:S),cons(X:S,XS:S)) -> sel(N:S,XS:S) 0.002/0.002 zWquot(cons(X:S,XS:S),cons(Y:S,YS:S)) -> cons(quot(X:S,Y:S),zWquot(XS:S,YS:S)) 0.002/0.002 zWquot(nil,XS:S) -> nil 0.002/0.002 zWquot(XS:S,nil) -> nil 0.002/0.002 ) 0.002/0.002 ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 0.002/0.002 0.002/0.002 0.002/0.002 Problem 1: 0.002/0.002 0.002/0.002 CleanTRS Processor: 0.002/0.002 0.002/0.002 ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 0.002/0.002 Confluence Problem: 0.002/0.002 (VAR vNonEmpty:S N:S X:S XS:S Y:S YS:S) 0.002/0.002 (STRATEGY CONTEXTSENSITIVE 0.002/0.002 (from 1) 0.002/0.002 (minus 1 2) 0.002/0.002 (quot 1 2) 0.002/0.002 (sel 1 2) 0.002/0.002 (zWquot 1 2) 0.002/0.002 (0) 0.002/0.002 (cons 1) 0.002/0.002 (fSNonEmpty) 0.002/0.002 (nil) 0.002/0.002 (s 1) 0.002/0.002 ) 0.002/0.002 (RULES 0.002/0.002 from(X:S) -> cons(X:S,from(s(X:S))) 0.002/0.002 minus(s(X:S),s(Y:S)) -> minus(X:S,Y:S) 0.002/0.002 minus(X:S,0) -> 0 0.002/0.002 quot(0,s(Y:S)) -> 0 0.002/0.002 quot(s(X:S),s(Y:S)) -> s(quot(minus(X:S,Y:S),s(Y:S))) 0.002/0.002 sel(0,cons(X:S,XS:S)) -> X:S 0.002/0.002 sel(s(N:S),cons(X:S,XS:S)) -> sel(N:S,XS:S) 0.002/0.002 zWquot(cons(X:S,XS:S),cons(Y:S,YS:S)) -> cons(quot(X:S,Y:S),zWquot(XS:S,YS:S)) 0.002/0.002 zWquot(nil,XS:S) -> nil 0.002/0.002 zWquot(XS:S,nil) -> nil 0.002/0.002 ) 0.002/0.002 ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 0.002/0.002 0.002/0.002 0.002/0.002 Problem 1: 0.002/0.002 0.002/0.002 Modular Confluence Combinations Decomposition Processor: 0.002/0.002 It is a CTRS -> No modular confluence 0.002/0.002 0.002/0.002 Problem 1: 0.002/0.002 CS-TRS Processor: 0.002/0.002 R is a CS-TRS 0.002/0.002 0.002/0.002 Problem 1: 0.002/0.002 ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 0.002/0.002 Confluence Problem: 0.002/0.002 (VAR vNonEmpty:S N:S X:S XS:S Y:S YS:S) 0.002/0.002 (STRATEGY CONTEXTSENSITIVE 0.002/0.002 (from 1) 0.002/0.002 (minus 1 2) 0.002/0.002 (quot 1 2) 0.002/0.002 (sel 1 2) 0.002/0.002 (zWquot 1 2) 0.002/0.002 (0) 0.002/0.002 (cons 1) 0.002/0.002 (fSNonEmpty) 0.002/0.002 (nil) 0.002/0.002 (s 1) 0.002/0.002 ) 0.002/0.002 (RULES 0.002/0.002 from(X:S) -> cons(X:S,from(s(X:S))) 0.002/0.002 minus(s(X:S),s(Y:S)) -> minus(X:S,Y:S) 0.002/0.002 minus(X:S,0) -> 0 0.002/0.002 quot(0,s(Y:S)) -> 0 0.002/0.002 quot(s(X:S),s(Y:S)) -> s(quot(minus(X:S,Y:S),s(Y:S))) 0.002/0.002 sel(0,cons(X:S,XS:S)) -> X:S 0.002/0.002 sel(s(N:S),cons(X:S,XS:S)) -> sel(N:S,XS:S) 0.002/0.002 zWquot(cons(X:S,XS:S),cons(Y:S,YS:S)) -> cons(quot(X:S,Y:S),zWquot(XS:S,YS:S)) 0.002/0.002 zWquot(nil,XS:S) -> nil 0.002/0.002 zWquot(XS:S,nil) -> nil 0.002/0.002 ) 0.002/0.002 ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 0.002/0.002 0.002/0.002 Extended u-Critical Pairs NonLHRV Processor [JLAMP21]: 0.002/0.002 ->Extended u-Critical Pair: 0.002/0.002 Rule 1 (l :-> r) => from(x6:S) -> cons(x6:S,from(s(x6:S))) 0.002/0.002 Rule 1 (l' :-> r') => from(X:S) -> cons(X:S,from(s(X:S))) 0.002/0.002 Var => x6:S 0.002/0.002 Pos x6:S in l => [1] 0.002/0.002 Sigma => {x6:S -> from(X:S)} 0.002/0.002 s => cons(from(X:S),from(s(from(X:S)))) 0.002/0.002 t => from(cons(X:S,from(s(X:S)))) 0.002/0.002 NW => 0 0.002/0.002 0.002/0.002 0.002/0.002 ->Extended u-Critical Pair: 0.002/0.002 Rule 1 (l :-> r) => from(x6:S) -> cons(x6:S,from(s(x6:S))) 0.002/0.002 Rule 2 (l' :-> r') => minus(s(X:S),s(Y:S)) -> minus(X:S,Y:S) 0.002/0.002 Var => x6:S 0.002/0.002 Pos x6:S in l => [1] 0.002/0.002 Sigma => {x6:S -> minus(s(X:S),s(Y:S))} 0.002/0.002 s => cons(minus(s(X:S),s(Y:S)),from(s(minus(s(X:S),s(Y:S))))) 0.002/0.002 t => from(minus(X:S,Y:S)) 0.002/0.002 NW => 0 0.002/0.002 0.002/0.002 0.002/0.002 ->Extended u-Critical Pair: 0.002/0.002 Rule 1 (l :-> r) => from(x6:S) -> cons(x6:S,from(s(x6:S))) 0.002/0.002 Rule 3 (l' :-> r') => minus(X:S,0) -> 0 0.002/0.002 Var => x6:S 0.002/0.002 Pos x6:S in l => [1] 0.002/0.002 Sigma => {x6:S -> minus(X:S,0)} 0.002/0.002 s => cons(minus(X:S,0),from(s(minus(X:S,0)))) 0.002/0.002 t => from(0) 0.002/0.002 NW => 0 0.002/0.002 0.002/0.002 0.002/0.002 ->Extended u-Critical Pair: 0.002/0.002 Rule 1 (l :-> r) => from(x6:S) -> cons(x6:S,from(s(x6:S))) 0.002/0.002 Rule 4 (l' :-> r') => quot(0,s(Y:S)) -> 0 0.002/0.002 Var => x6:S 0.002/0.002 Pos x6:S in l => [1] 0.002/0.002 Sigma => {x6:S -> quot(0,s(Y:S))} 0.002/0.002 s => cons(quot(0,s(Y:S)),from(s(quot(0,s(Y:S))))) 0.002/0.002 t => from(0) 0.002/0.002 NW => 0 0.002/0.002 0.002/0.002 0.002/0.002 ->Extended u-Critical Pair: 0.002/0.002 Rule 1 (l :-> r) => from(x6:S) -> cons(x6:S,from(s(x6:S))) 0.002/0.002 Rule 5 (l' :-> r') => quot(s(X:S),s(Y:S)) -> s(quot(minus(X:S,Y:S),s(Y:S))) 0.002/0.002 Var => x6:S 0.002/0.002 Pos x6:S in l => [1] 0.002/0.002 Sigma => {x6:S -> quot(s(X:S),s(Y:S))} 0.002/0.002 s => cons(quot(s(X:S),s(Y:S)),from(s(quot(s(X:S),s(Y:S))))) 0.002/0.002 t => from(s(quot(minus(X:S,Y:S),s(Y:S)))) 0.002/0.002 NW => 0 0.002/0.002 0.002/0.002 0.002/0.002 ->Extended u-Critical Pair: 0.002/0.002 Rule 1 (l :-> r) => from(x6:S) -> cons(x6:S,from(s(x6:S))) 0.002/0.002 Rule 6 (l' :-> r') => sel(0,cons(X:S,XS:S)) -> X:S 0.002/0.002 Var => x6:S 0.002/0.002 Pos x6:S in l => [1] 0.002/0.002 Sigma => {x6:S -> sel(0,cons(X:S,XS:S))} 0.002/0.002 s => cons(sel(0,cons(X:S,XS:S)),from(s(sel(0,cons(X:S,XS:S))))) 0.002/0.002 t => from(X:S) 0.002/0.002 NW => 0 0.002/0.002 0.002/0.002 0.002/0.002 ->Extended u-Critical Pair: 0.002/0.002 Rule 1 (l :-> r) => from(x6:S) -> cons(x6:S,from(s(x6:S))) 0.002/0.002 Rule 7 (l' :-> r') => sel(s(N:S),cons(X:S,XS:S)) -> sel(N:S,XS:S) 0.002/0.002 Var => x6:S 0.002/0.002 Pos x6:S in l => [1] 0.002/0.002 Sigma => {x6:S -> sel(s(N:S),cons(X:S,XS:S))} 0.002/0.002 s => cons(sel(s(N:S),cons(X:S,XS:S)),from(s(sel(s(N:S),cons(X:S,XS:S))))) 0.002/0.002 t => from(sel(N:S,XS:S)) 0.002/0.002 NW => 0 0.002/0.002 0.002/0.002 0.002/0.002 ->Extended u-Critical Pair: 0.002/0.002 Rule 1 (l :-> r) => from(x6:S) -> cons(x6:S,from(s(x6:S))) 0.002/0.002 Rule 8 (l' :-> r') => zWquot(cons(X:S,XS:S),cons(Y:S,YS:S)) -> cons(quot(X:S,Y:S),zWquot(XS:S,YS:S)) 0.002/0.002 Var => x6:S 0.002/0.002 Pos x6:S in l => [1] 0.002/0.002 Sigma => {x6:S -> zWquot(cons(X:S,XS:S),cons(Y:S,YS:S))} 0.002/0.002 s => cons(zWquot(cons(X:S,XS:S),cons(Y:S,YS:S)),from(s(zWquot(cons(X:S,XS:S),cons(Y:S,YS:S))))) 0.002/0.002 t => from(cons(quot(X:S,Y:S),zWquot(XS:S,YS:S))) 0.002/0.002 NW => 0 0.002/0.002 0.002/0.002 0.002/0.002 ->Extended u-Critical Pair: 0.002/0.002 Rule 1 (l :-> r) => from(x6:S) -> cons(x6:S,from(s(x6:S))) 0.002/0.002 Rule 9 (l' :-> r') => zWquot(nil,XS:S) -> nil 0.002/0.002 Var => x6:S 0.002/0.002 Pos x6:S in l => [1] 0.002/0.002 Sigma => {x6:S -> zWquot(nil,XS:S)} 0.002/0.002 s => cons(zWquot(nil,XS:S),from(s(zWquot(nil,XS:S)))) 0.002/0.002 t => from(nil) 0.002/0.002 NW => 0 0.002/0.002 0.002/0.002 0.002/0.002 ->Extended u-Critical Pair: 0.002/0.002 Rule 1 (l :-> r) => from(x6:S) -> cons(x6:S,from(s(x6:S))) 0.002/0.002 Rule 10 (l' :-> r') => zWquot(XS:S,nil) -> nil 0.002/0.002 Var => x6:S 0.002/0.002 Pos x6:S in l => [1] 0.002/0.002 Sigma => {x6:S -> zWquot(XS:S,nil)} 0.002/0.002 s => cons(zWquot(XS:S,nil),from(s(zWquot(XS:S,nil)))) 0.002/0.002 t => from(nil) 0.002/0.002 NW => 0 0.002/0.002 0.002/0.002 0.002/0.002 Problem 1: 0.002/0.002 ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 0.002/0.002 Confluence Problem: 0.002/0.002 (VAR vNonEmpty:S N:S X:S XS:S Y:S YS:S) 0.002/0.002 (STRATEGY CONTEXTSENSITIVE 0.002/0.002 (from 1) 0.002/0.002 (minus 1 2) 0.002/0.002 (quot 1 2) 0.002/0.002 (sel 1 2) 0.002/0.002 (zWquot 1 2) 0.002/0.002 (0) 0.002/0.002 (cons 1) 0.002/0.002 (fSNonEmpty) 0.002/0.002 (nil) 0.002/0.002 (s 1) 0.002/0.002 ) 0.002/0.002 (RULES 0.002/0.002 from(X:S) -> cons(X:S,from(s(X:S))) 0.002/0.002 minus(s(X:S),s(Y:S)) -> minus(X:S,Y:S) 0.002/0.002 minus(X:S,0) -> 0 0.002/0.002 quot(0,s(Y:S)) -> 0 0.002/0.002 quot(s(X:S),s(Y:S)) -> s(quot(minus(X:S,Y:S),s(Y:S))) 0.002/0.002 sel(0,cons(X:S,XS:S)) -> X:S 0.002/0.002 sel(s(N:S),cons(X:S,XS:S)) -> sel(N:S,XS:S) 0.002/0.002 zWquot(cons(X:S,XS:S),cons(Y:S,YS:S)) -> cons(quot(X:S,Y:S),zWquot(XS:S,YS:S)) 0.002/0.002 zWquot(nil,XS:S) -> nil 0.002/0.002 zWquot(XS:S,nil) -> nil 0.002/0.002 ) 0.002/0.002 Critical Pairs: 0.002/0.002 => Not trivial, Not overlay, NW0, N1 0.002/0.002 => Not trivial, Not overlay, NW0, N2 0.002/0.002 => Not trivial, Not overlay, NW0, N3 0.002/0.002 => Not trivial, Not overlay, NW0, N4 0.002/0.002 => Not trivial, Not overlay, NW0, N5 0.002/0.002 => Not trivial, Not overlay, NW0, N6 0.002/0.002 => Not trivial, Not overlay, NW0, N7 0.002/0.002 => Not trivial, Not overlay, NW0, N8 0.002/0.002 => Not trivial, Not overlay, NW0, N9 0.002/0.002 => Not trivial, Not overlay, NW0, N10 0.002/0.002 ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 0.002/0.002 0.002/0.002 Huet Levy Processor: 0.002/0.002 -> Rules: 0.002/0.002 from(X:S) -> cons(X:S,from(s(X:S))) 0.002/0.002 minus(s(X:S),s(Y:S)) -> minus(X:S,Y:S) 0.002/0.002 minus(X:S,0) -> 0 0.002/0.002 quot(0,s(Y:S)) -> 0 0.002/0.002 quot(s(X:S),s(Y:S)) -> s(quot(minus(X:S,Y:S),s(Y:S))) 0.002/0.002 sel(0,cons(X:S,XS:S)) -> X:S 0.002/0.002 sel(s(N:S),cons(X:S,XS:S)) -> sel(N:S,XS:S) 0.002/0.002 zWquot(cons(X:S,XS:S),cons(Y:S,YS:S)) -> cons(quot(X:S,Y:S),zWquot(XS:S,YS:S)) 0.002/0.002 zWquot(nil,XS:S) -> nil 0.002/0.002 zWquot(XS:S,nil) -> nil 0.002/0.002 -> Vars: 0.002/0.002 X, X, Y, X, Y, X, Y, X, XS, N, X, XS, X, XS, Y, YS, XS, XS 0.002/0.002 -> UVars: 0.002/0.002 (UV-RuleId: 1, UV-LActive: [X], UV-RActive: [X], UV-LFrozen: [], UV-RFrozen: [X]) 0.002/0.002 (UV-RuleId: 2, UV-LActive: [X, Y], UV-RActive: [X, Y], UV-LFrozen: [], UV-RFrozen: []) 0.002/0.002 (UV-RuleId: 3, UV-LActive: [X], UV-RActive: [], UV-LFrozen: [], UV-RFrozen: []) 0.002/0.002 (UV-RuleId: 4, UV-LActive: [Y], UV-RActive: [], UV-LFrozen: [], UV-RFrozen: []) 0.002/0.002 (UV-RuleId: 5, UV-LActive: [X, Y], UV-RActive: [X, Y], UV-LFrozen: [], UV-RFrozen: []) 0.002/0.002 (UV-RuleId: 6, UV-LActive: [X], UV-RActive: [X], UV-LFrozen: [XS], UV-RFrozen: []) 0.002/0.002 (UV-RuleId: 7, UV-LActive: [N, X], UV-RActive: [N, XS], UV-LFrozen: [XS], UV-RFrozen: []) 0.002/0.002 (UV-RuleId: 8, UV-LActive: [X, Y], UV-RActive: [X, Y], UV-LFrozen: [XS, YS], UV-RFrozen: [XS, YS]) 0.002/0.002 (UV-RuleId: 9, UV-LActive: [XS], UV-RActive: [], UV-LFrozen: [], UV-RFrozen: []) 0.002/0.002 (UV-RuleId: 10, UV-LActive: [XS], UV-RActive: [], UV-LFrozen: [], UV-RFrozen: []) 0.002/0.002 -> FVars: 0.002/0.002 x6, x7, x8, x9, x10, x11, x12, x13, x14, x15, x16, x17, x18, x19, x20, x21, x22, x23 0.002/0.002 -> PVars: 0.002/0.002 X: [x6, x7, x9, x11, x13, x16, x18], Y: [x8, x10, x12, x20], XS: [x14, x17, x19, x22, x23], N: [x15], YS: [x21] 0.002/0.002 0.002/0.002 -> Rlps: 0.002/0.002 (rule: from(x6:S) -> cons(x6:S,from(s(x6:S))), id: 1, possubterms: from(x6:S)->[]) 0.002/0.002 (rule: minus(s(x7:S),s(x8:S)) -> minus(x7:S,x8:S), id: 2, possubterms: minus(s(x7:S),s(x8:S))->[], s(x7:S)->[1], s(x8:S)->[2]) 0.002/0.002 (rule: minus(x9:S,0) -> 0, id: 3, possubterms: minus(x9:S,0)->[], 0->[2]) 0.002/0.002 (rule: quot(0,s(x10:S)) -> 0, id: 4, possubterms: quot(0,s(x10:S))->[], 0->[1], s(x10:S)->[2]) 0.002/0.002 (rule: quot(s(x11:S),s(x12:S)) -> s(quot(minus(x11:S,x12:S),s(x12:S))), id: 5, possubterms: quot(s(x11:S),s(x12:S))->[], s(x11:S)->[1], s(x12:S)->[2]) 0.002/0.002 (rule: sel(0,cons(x13:S,x14:S)) -> x13:S, id: 6, possubterms: sel(0,cons(x13:S,x14:S))->[], 0->[1], cons(x13:S,x14:S)->[2]) 0.002/0.002 (rule: sel(s(x15:S),cons(x16:S,x17:S)) -> sel(x15:S,x17:S), id: 7, possubterms: sel(s(x15:S),cons(x16:S,x17:S))->[], s(x15:S)->[1], cons(x16:S,x17:S)->[2]) 0.002/0.002 (rule: zWquot(cons(x18:S,x19:S),cons(x20:S,x21:S)) -> cons(quot(x18:S,x20:S),zWquot(x19:S,x21:S)), id: 8, possubterms: zWquot(cons(x18:S,x19:S),cons(x20:S,x21:S))->[], cons(x18:S,x19:S)->[1], cons(x20:S,x21:S)->[2]) 0.002/0.002 (rule: zWquot(nil,x22:S) -> nil, id: 9, possubterms: zWquot(nil,x22:S)->[], nil->[1]) 0.002/0.002 (rule: zWquot(x23:S,nil) -> nil, id: 10, possubterms: zWquot(x23:S,nil)->[], nil->[2]) 0.002/0.002 0.002/0.002 -> Unifications: 0.002/0.002 (R10 unifies with R9 at p: [], l: zWquot(x23:S,nil), lp: zWquot(x23:S,nil), sig: {XS:S -> nil,x23:S -> nil}, l': zWquot(nil,XS:S), r: nil, r': nil) 0.002/0.002 0.002/0.002 -> Critical pairs info: 0.002/0.002 => Not trivial, Not overlay, NW0, N1 0.002/0.002 => Not trivial, Not overlay, NW0, N2 0.002/0.002 => Trivial, Overlay, NW0, N3 0.002/0.002 => Not trivial, Not overlay, NW0, N4 0.002/0.002 => Not trivial, Not overlay, NW0, N5 0.002/0.002 => Not trivial, Not overlay, NW0, N6 0.002/0.002 => Not trivial, Not overlay, NW0, N7 0.002/0.002 => Not trivial, Not overlay, NW0, N8 0.002/0.002 => Not trivial, Not overlay, NW0, N9 0.002/0.002 => Not trivial, Not overlay, NW0, N10 0.002/0.002 => Not trivial, Not overlay, NW0, N11 0.002/0.002 0.002/0.002 -> Problem conclusions: 0.002/0.002 Left linear, Not right linear, Not linear 0.002/0.002 Not weakly orthogonal, Not almost orthogonal, Not orthogonal 0.002/0.002 Not Huet-Levy confluent, Not Newman confluent 0.002/0.002 R is a CS-TRS, Not left-homogeneous u-replacing variables 0.002/0.002 0.002/0.002 0.002/0.002 Problem 1: 0.002/0.002 No Convergence Brute Force Processor: 0.002/0.002 -> Rewritings: 0.002/0.002 s: cons(sel(s(N:S),cons(X:S,XS:S)),from(s(sel(s(N:S),cons(X:S,XS:S))))) 0.002/0.002 Nodes: [0,1] 0.002/0.002 Edges: [(0,1)] 0.002/0.002 ID: 0 => ('cons(sel(s(N:S),cons(X:S,XS:S)),from(s(sel(s(N:S),cons(X:S,XS:S)))))', D0) 0.002/0.002 ID: 1 => ('cons(sel(N:S,XS:S),from(s(sel(s(N:S),cons(X:S,XS:S)))))', D1, R7, P[1], S{x15:S -> N:S, x16:S -> X:S, x17:S -> XS:S}), NR: 'sel(N:S,XS:S)' 0.002/0.002 t: from(sel(N:S,XS:S)) 0.002/0.002 Nodes: [0,1] 0.002/0.002 Edges: [(0,1)] 0.002/0.002 ID: 0 => ('from(sel(N:S,XS:S))', D0) 0.002/0.002 ID: 1 => ('cons(sel(N:S,XS:S),from(s(sel(N:S,XS:S))))', D1, R1, P[], S{x6:S -> sel(N:S,XS:S)}), NR: 'cons(sel(N:S,XS:S),from(s(sel(N:S,XS:S))))' 0.002/0.002 cons(sel(s(N:S),cons(X:S,XS:S)),from(s(sel(s(N:S),cons(X:S,XS:S))))) ->* no union *<- from(sel(N:S,XS:S)) 0.002/0.002 "Not joinable" 0.002/0.002 0.002/0.002 The problem is not joinable. 0.002/0.002 0.00user 0.00system 0:00.02elapsed 56%CPU (0avgtext+0avgdata 10904maxresident)k 0.002/0.002 0inputs+0outputs (0major+1071minor)pagefaults 0swaps