883.24/291.57 WORST_CASE(Omega(n^1), O(n^2)) 883.50/291.59 proof of /export/starexec/sandbox/benchmark/theBenchmark.xml 883.50/291.59 # AProVE Commit ID: 48fb2092695e11cc9f56e44b17a92a5f88ffb256 marcel 20180622 unpublished dirty 883.50/291.59 883.50/291.59 883.50/291.59 The Runtime Complexity (innermost) of the given CpxTRS could be proven to be BOUNDS(n^1, n^2). 883.50/291.59 883.50/291.59 (0) CpxTRS 883.50/291.59 (1) RelTrsToWeightedTrsProof [BOTH BOUNDS(ID, ID), 0 ms] 883.50/291.59 (2) CpxWeightedTrs 883.50/291.59 (3) TypeInferenceProof [BOTH BOUNDS(ID, ID), 0 ms] 883.50/291.59 (4) CpxTypedWeightedTrs 883.50/291.59 (5) CompletionProof [UPPER BOUND(ID), 0 ms] 883.50/291.59 (6) CpxTypedWeightedCompleteTrs 883.50/291.59 (7) CpxTypedWeightedTrsToRntsProof [UPPER BOUND(ID), 0 ms] 883.50/291.59 (8) CpxRNTS 883.50/291.59 (9) CompleteCoflocoProof [FINISHED, 243 ms] 883.50/291.59 (10) BOUNDS(1, n^2) 883.50/291.59 (11) RelTrsToDecreasingLoopProblemProof [LOWER BOUND(ID), 0 ms] 883.50/291.59 (12) TRS for Loop Detection 883.50/291.59 (13) DecreasingLoopProof [LOWER BOUND(ID), 0 ms] 883.50/291.59 (14) BEST 883.50/291.59 (15) proven lower bound 883.50/291.59 (16) LowerBoundPropagationProof [FINISHED, 0 ms] 883.50/291.59 (17) BOUNDS(n^1, INF) 883.50/291.59 (18) TRS for Loop Detection 883.50/291.59 883.50/291.59 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (0) 883.50/291.59 Obligation: 883.50/291.59 The Runtime Complexity (innermost) of the given CpxTRS could be proven to be BOUNDS(n^1, n^2). 883.50/291.59 883.50/291.59 883.50/291.59 The TRS R consists of the following rules: 883.50/291.59 883.50/291.59 minus(x, y) -> cond(gt(x, y), x, y) 883.50/291.59 cond(false, x, y) -> 0 883.50/291.59 cond(true, x, y) -> s(minus(x, s(y))) 883.50/291.59 gt(0, v) -> false 883.50/291.59 gt(s(u), 0) -> true 883.50/291.59 gt(s(u), s(v)) -> gt(u, v) 883.50/291.59 883.50/291.59 S is empty. 883.50/291.59 Rewrite Strategy: INNERMOST 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (1) RelTrsToWeightedTrsProof (BOTH BOUNDS(ID, ID)) 883.50/291.59 Transformed relative TRS to weighted TRS 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (2) 883.50/291.59 Obligation: 883.50/291.59 The Runtime Complexity (innermost) of the given CpxWeightedTrs could be proven to be BOUNDS(1, n^2). 883.50/291.59 883.50/291.59 883.50/291.59 The TRS R consists of the following rules: 883.50/291.59 883.50/291.59 minus(x, y) -> cond(gt(x, y), x, y) [1] 883.50/291.59 cond(false, x, y) -> 0 [1] 883.50/291.59 cond(true, x, y) -> s(minus(x, s(y))) [1] 883.50/291.59 gt(0, v) -> false [1] 883.50/291.59 gt(s(u), 0) -> true [1] 883.50/291.59 gt(s(u), s(v)) -> gt(u, v) [1] 883.50/291.59 883.50/291.59 Rewrite Strategy: INNERMOST 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (3) TypeInferenceProof (BOTH BOUNDS(ID, ID)) 883.50/291.59 Infered types. 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (4) 883.50/291.59 Obligation: 883.50/291.59 Runtime Complexity Weighted TRS with Types. 883.50/291.59 The TRS R consists of the following rules: 883.50/291.59 883.50/291.59 minus(x, y) -> cond(gt(x, y), x, y) [1] 883.50/291.59 cond(false, x, y) -> 0 [1] 883.50/291.59 cond(true, x, y) -> s(minus(x, s(y))) [1] 883.50/291.59 gt(0, v) -> false [1] 883.50/291.59 gt(s(u), 0) -> true [1] 883.50/291.59 gt(s(u), s(v)) -> gt(u, v) [1] 883.50/291.59 883.50/291.59 The TRS has the following type information: 883.50/291.59 minus :: 0:s -> 0:s -> 0:s 883.50/291.59 cond :: false:true -> 0:s -> 0:s -> 0:s 883.50/291.59 gt :: 0:s -> 0:s -> false:true 883.50/291.59 false :: false:true 883.50/291.59 0 :: 0:s 883.50/291.59 true :: false:true 883.50/291.59 s :: 0:s -> 0:s 883.50/291.59 883.50/291.59 Rewrite Strategy: INNERMOST 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (5) CompletionProof (UPPER BOUND(ID)) 883.50/291.59 The TRS is a completely defined constructor system, as every type has a constant constructor and the following rules were added: 883.50/291.59 none 883.50/291.59 883.50/291.59 And the following fresh constants: none 883.50/291.59 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (6) 883.50/291.59 Obligation: 883.50/291.59 Runtime Complexity Weighted TRS where all functions are completely defined. The underlying TRS is: 883.50/291.59 883.50/291.59 Runtime Complexity Weighted TRS with Types. 883.50/291.59 The TRS R consists of the following rules: 883.50/291.59 883.50/291.59 minus(x, y) -> cond(gt(x, y), x, y) [1] 883.50/291.59 cond(false, x, y) -> 0 [1] 883.50/291.59 cond(true, x, y) -> s(minus(x, s(y))) [1] 883.50/291.59 gt(0, v) -> false [1] 883.50/291.59 gt(s(u), 0) -> true [1] 883.50/291.59 gt(s(u), s(v)) -> gt(u, v) [1] 883.50/291.59 883.50/291.59 The TRS has the following type information: 883.50/291.59 minus :: 0:s -> 0:s -> 0:s 883.50/291.59 cond :: false:true -> 0:s -> 0:s -> 0:s 883.50/291.59 gt :: 0:s -> 0:s -> false:true 883.50/291.59 false :: false:true 883.50/291.59 0 :: 0:s 883.50/291.59 true :: false:true 883.50/291.59 s :: 0:s -> 0:s 883.50/291.59 883.50/291.59 Rewrite Strategy: INNERMOST 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (7) CpxTypedWeightedTrsToRntsProof (UPPER BOUND(ID)) 883.50/291.59 Transformed the TRS into an over-approximating RNTS by (improved) Size Abstraction. 883.50/291.59 The constant constructors are abstracted as follows: 883.50/291.59 883.50/291.59 false => 0 883.50/291.59 0 => 0 883.50/291.59 true => 1 883.50/291.59 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (8) 883.50/291.59 Obligation: 883.50/291.59 Complexity RNTS consisting of the following rules: 883.50/291.59 883.50/291.59 cond(z, z', z'') -{ 1 }-> 0 :|: z' = x, z'' = y, x >= 0, y >= 0, z = 0 883.50/291.59 cond(z, z', z'') -{ 1 }-> 1 + minus(x, 1 + y) :|: z' = x, z'' = y, z = 1, x >= 0, y >= 0 883.50/291.59 gt(z, z') -{ 1 }-> gt(u, v) :|: v >= 0, z' = 1 + v, z = 1 + u, u >= 0 883.50/291.59 gt(z, z') -{ 1 }-> 1 :|: z = 1 + u, z' = 0, u >= 0 883.50/291.59 gt(z, z') -{ 1 }-> 0 :|: v >= 0, z' = v, z = 0 883.50/291.59 minus(z, z') -{ 1 }-> cond(gt(x, y), x, y) :|: x >= 0, y >= 0, z = x, z' = y 883.50/291.59 883.50/291.59 Only complete derivations are relevant for the runtime complexity. 883.50/291.59 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (9) CompleteCoflocoProof (FINISHED) 883.50/291.59 Transformed the RNTS (where only complete derivations are relevant) into cost relations for CoFloCo: 883.50/291.59 883.50/291.59 eq(start(V1, V, V5),0,[minus(V1, V, Out)],[V1 >= 0,V >= 0]). 883.50/291.59 eq(start(V1, V, V5),0,[cond(V1, V, V5, Out)],[V1 >= 0,V >= 0,V5 >= 0]). 883.50/291.59 eq(start(V1, V, V5),0,[gt(V1, V, Out)],[V1 >= 0,V >= 0]). 883.50/291.59 eq(minus(V1, V, Out),1,[gt(V3, V2, Ret0),cond(Ret0, V3, V2, Ret)],[Out = Ret,V3 >= 0,V2 >= 0,V1 = V3,V = V2]). 883.50/291.59 eq(cond(V1, V, V5, Out),1,[],[Out = 0,V = V4,V5 = V6,V4 >= 0,V6 >= 0,V1 = 0]). 883.50/291.59 eq(cond(V1, V, V5, Out),1,[minus(V8, 1 + V7, Ret1)],[Out = 1 + Ret1,V = V8,V5 = V7,V1 = 1,V8 >= 0,V7 >= 0]). 883.50/291.59 eq(gt(V1, V, Out),1,[],[Out = 0,V9 >= 0,V = V9,V1 = 0]). 883.50/291.59 eq(gt(V1, V, Out),1,[],[Out = 1,V1 = 1 + V10,V = 0,V10 >= 0]). 883.50/291.59 eq(gt(V1, V, Out),1,[gt(V12, V11, Ret2)],[Out = Ret2,V11 >= 0,V = 1 + V11,V1 = 1 + V12,V12 >= 0]). 883.50/291.59 input_output_vars(minus(V1,V,Out),[V1,V],[Out]). 883.50/291.59 input_output_vars(cond(V1,V,V5,Out),[V1,V,V5],[Out]). 883.50/291.59 input_output_vars(gt(V1,V,Out),[V1,V],[Out]). 883.50/291.59 883.50/291.59 883.50/291.59 CoFloCo proof output: 883.50/291.59 Preprocessing Cost Relations 883.50/291.59 ===================================== 883.50/291.59 883.50/291.59 #### Computed strongly connected components 883.50/291.59 0. recursive : [gt/3] 883.50/291.59 1. recursive : [cond/4,minus/3] 883.50/291.59 2. non_recursive : [start/3] 883.50/291.59 883.50/291.59 #### Obtained direct recursion through partial evaluation 883.50/291.59 0. SCC is partially evaluated into gt/3 883.50/291.59 1. SCC is partially evaluated into minus/3 883.50/291.59 2. SCC is partially evaluated into start/3 883.50/291.59 883.50/291.59 Control-Flow Refinement of Cost Relations 883.50/291.59 ===================================== 883.50/291.59 883.50/291.59 ### Specialization of cost equations gt/3 883.50/291.59 * CE 9 is refined into CE [10] 883.50/291.59 * CE 8 is refined into CE [11] 883.50/291.59 * CE 7 is refined into CE [12] 883.50/291.59 883.50/291.59 883.50/291.59 ### Cost equations --> "Loop" of gt/3 883.50/291.59 * CEs [11] --> Loop 8 883.50/291.59 * CEs [12] --> Loop 9 883.50/291.59 * CEs [10] --> Loop 10 883.50/291.59 883.50/291.59 ### Ranking functions of CR gt(V1,V,Out) 883.50/291.59 * RF of phase [10]: [V,V1] 883.50/291.59 883.50/291.59 #### Partial ranking functions of CR gt(V1,V,Out) 883.50/291.59 * Partial RF of phase [10]: 883.50/291.59 - RF of loop [10:1]: 883.50/291.59 V 883.50/291.59 V1 883.50/291.59 883.50/291.59 883.50/291.59 ### Specialization of cost equations minus/3 883.50/291.59 * CE 6 is refined into CE [13,14] 883.50/291.59 * CE 5 is refined into CE [15,16] 883.50/291.59 883.50/291.59 883.50/291.59 ### Cost equations --> "Loop" of minus/3 883.50/291.59 * CEs [16] --> Loop 11 883.50/291.59 * CEs [15] --> Loop 12 883.50/291.59 * CEs [14] --> Loop 13 883.50/291.59 * CEs [13] --> Loop 14 883.50/291.59 883.50/291.59 ### Ranking functions of CR minus(V1,V,Out) 883.50/291.59 * RF of phase [11]: [V1-V] 883.50/291.59 883.50/291.59 #### Partial ranking functions of CR minus(V1,V,Out) 883.50/291.59 * Partial RF of phase [11]: 883.50/291.59 - RF of loop [11:1]: 883.50/291.59 V1-V 883.50/291.59 883.50/291.59 883.50/291.59 ### Specialization of cost equations start/3 883.50/291.59 * CE 1 is refined into CE [17,18,19] 883.50/291.59 * CE 2 is refined into CE [20] 883.50/291.59 * CE 3 is refined into CE [21,22,23,24,25] 883.50/291.59 * CE 4 is refined into CE [26,27,28,29] 883.50/291.59 883.50/291.59 883.50/291.59 ### Cost equations --> "Loop" of start/3 883.50/291.59 * CEs [25,29] --> Loop 15 883.50/291.59 * CEs [19] --> Loop 16 883.50/291.59 * CEs [18,24,28] --> Loop 17 883.50/291.59 * CEs [17,22,23,27] --> Loop 18 883.50/291.59 * CEs [20,21,26] --> Loop 19 883.50/291.59 883.50/291.59 ### Ranking functions of CR start(V1,V,V5) 883.50/291.59 883.50/291.59 #### Partial ranking functions of CR start(V1,V,V5) 883.50/291.59 883.50/291.59 883.50/291.59 Computing Bounds 883.50/291.59 ===================================== 883.50/291.59 883.50/291.59 #### Cost of chains of gt(V1,V,Out): 883.50/291.59 * Chain [[10],9]: 1*it(10)+1 883.50/291.59 Such that:it(10) =< V1 883.50/291.59 883.50/291.59 with precondition: [Out=0,V1>=1,V>=V1] 883.50/291.59 883.50/291.59 * Chain [[10],8]: 1*it(10)+1 883.50/291.59 Such that:it(10) =< V 883.50/291.59 883.50/291.59 with precondition: [Out=1,V>=1,V1>=V+1] 883.50/291.59 883.50/291.59 * Chain [9]: 1 883.50/291.59 with precondition: [V1=0,Out=0,V>=0] 883.50/291.59 883.50/291.59 * Chain [8]: 1 883.50/291.59 with precondition: [V=0,Out=1,V1>=1] 883.50/291.59 883.50/291.59 883.50/291.59 #### Cost of chains of minus(V1,V,Out): 883.50/291.59 * Chain [[11],13]: 3*it(11)+1*s(1)+1*s(4)+3 883.50/291.59 Such that:it(11) =< Out 883.50/291.59 aux(2) =< V+Out 883.50/291.59 s(1) =< aux(2) 883.50/291.59 s(4) =< it(11)*aux(2) 883.50/291.59 883.50/291.59 with precondition: [V1=Out+V,V>=1,V1>=V+1] 883.50/291.59 883.50/291.59 * Chain [14]: 3 883.50/291.59 with precondition: [V1=0,Out=0,V>=0] 883.50/291.59 883.50/291.59 * Chain [13]: 1*s(1)+3 883.50/291.59 Such that:s(1) =< V1 883.50/291.59 883.50/291.59 with precondition: [Out=0,V1>=1,V>=V1] 883.50/291.59 883.50/291.59 * Chain [12,[11],13]: 4*it(11)+1*s(4)+6 883.50/291.59 Such that:aux(3) =< Out 883.50/291.59 it(11) =< aux(3) 883.50/291.59 s(4) =< it(11)*aux(3) 883.50/291.59 883.50/291.59 with precondition: [V=0,V1=Out,V1>=2] 883.50/291.59 883.50/291.59 * Chain [12,13]: 1*s(1)+6 883.50/291.59 Such that:s(1) =< 1 883.50/291.59 883.50/291.59 with precondition: [V1=1,V=0,Out=1] 883.50/291.59 883.50/291.59 883.50/291.59 #### Cost of chains of start(V1,V,V5): 883.50/291.59 * Chain [19]: 3 883.50/291.59 with precondition: [V1=0,V>=0] 883.50/291.59 883.50/291.59 * Chain [18]: 1*s(5)+4*s(7)+1*s(8)+6 883.50/291.59 Such that:s(5) =< 1 883.50/291.59 s(6) =< V1 883.50/291.59 s(7) =< s(6) 883.50/291.59 s(8) =< s(7)*s(6) 883.50/291.59 883.50/291.59 with precondition: [V=0,V1>=1] 883.50/291.59 883.50/291.59 * Chain [17]: 1*s(9)+2*s(10)+4 883.50/291.59 Such that:s(9) =< V 883.50/291.59 aux(4) =< V1 883.50/291.59 s(10) =< aux(4) 883.50/291.59 883.50/291.59 with precondition: [V1>=1,V>=V1] 883.50/291.59 883.50/291.59 * Chain [16]: 3*s(12)+1*s(14)+1*s(15)+4 883.50/291.59 Such that:s(13) =< V 883.50/291.59 s(12) =< V-V5 883.50/291.59 s(14) =< s(13) 883.50/291.59 s(15) =< s(12)*s(13) 883.50/291.59 883.50/291.59 with precondition: [V1=1,V5>=0,V>=V5+2] 883.50/291.59 883.50/291.59 * Chain [15]: 3*s(16)+1*s(18)+1*s(19)+1*s(20)+3 883.50/291.59 Such that:s(17) =< V1 883.50/291.59 s(16) =< V1-V 883.50/291.59 s(20) =< V 883.50/291.59 s(18) =< s(17) 883.50/291.59 s(19) =< s(16)*s(17) 883.50/291.59 883.50/291.59 with precondition: [V>=1,V1>=V+1] 883.50/291.59 883.50/291.59 883.50/291.59 Closed-form bounds of start(V1,V,V5): 883.50/291.59 ------------------------------------- 883.50/291.59 * Chain [19] with precondition: [V1=0,V>=0] 883.50/291.59 - Upper bound: 3 883.50/291.59 - Complexity: constant 883.50/291.59 * Chain [18] with precondition: [V=0,V1>=1] 883.50/291.59 - Upper bound: 4*V1+7+V1*V1 883.50/291.59 - Complexity: n^2 883.50/291.59 * Chain [17] with precondition: [V1>=1,V>=V1] 883.50/291.59 - Upper bound: 2*V1+V+4 883.50/291.59 - Complexity: n 883.50/291.59 * Chain [16] with precondition: [V1=1,V5>=0,V>=V5+2] 883.50/291.59 - Upper bound: 3*V-3*V5+(V+4+(V-V5)*V) 883.50/291.59 - Complexity: n^2 883.50/291.59 * Chain [15] with precondition: [V>=1,V1>=V+1] 883.50/291.59 - Upper bound: 3*V1-3*V+(V1+3+(V1-V)*V1+V) 883.50/291.59 - Complexity: n^2 883.50/291.59 883.50/291.59 ### Maximum cost of start(V1,V,V5): max([max([V1+1+max([V,2*V1+3+V1*V1]),nat(V1-V)*V1+V+nat(V1-V)*3])+V1,V+1+nat(V-V5)*V+nat(V-V5)*3])+3 883.50/291.59 Asymptotic class: n^2 883.50/291.59 * Total analysis performed in 170 ms. 883.50/291.59 883.50/291.59 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (10) 883.50/291.59 BOUNDS(1, n^2) 883.50/291.59 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (11) RelTrsToDecreasingLoopProblemProof (LOWER BOUND(ID)) 883.50/291.59 Transformed a relative TRS into a decreasing-loop problem. 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (12) 883.50/291.59 Obligation: 883.50/291.59 Analyzing the following TRS for decreasing loops: 883.50/291.59 883.50/291.59 The Runtime Complexity (innermost) of the given CpxTRS could be proven to be BOUNDS(n^1, n^2). 883.50/291.59 883.50/291.59 883.50/291.59 The TRS R consists of the following rules: 883.50/291.59 883.50/291.59 minus(x, y) -> cond(gt(x, y), x, y) 883.50/291.59 cond(false, x, y) -> 0 883.50/291.59 cond(true, x, y) -> s(minus(x, s(y))) 883.50/291.59 gt(0, v) -> false 883.50/291.59 gt(s(u), 0) -> true 883.50/291.59 gt(s(u), s(v)) -> gt(u, v) 883.50/291.59 883.50/291.59 S is empty. 883.50/291.59 Rewrite Strategy: INNERMOST 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (13) DecreasingLoopProof (LOWER BOUND(ID)) 883.50/291.59 The following loop(s) give(s) rise to the lower bound Omega(n^1): 883.50/291.59 883.50/291.59 The rewrite sequence 883.50/291.59 883.50/291.59 gt(s(u), s(v)) ->^+ gt(u, v) 883.50/291.59 883.50/291.59 gives rise to a decreasing loop by considering the right hand sides subterm at position []. 883.50/291.59 883.50/291.59 The pumping substitution is [u / s(u), v / s(v)]. 883.50/291.59 883.50/291.59 The result substitution is [ ]. 883.50/291.59 883.50/291.59 883.50/291.59 883.50/291.59 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (14) 883.50/291.59 Complex Obligation (BEST) 883.50/291.59 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (15) 883.50/291.59 Obligation: 883.50/291.59 Proved the lower bound n^1 for the following obligation: 883.50/291.59 883.50/291.59 The Runtime Complexity (innermost) of the given CpxTRS could be proven to be BOUNDS(n^1, n^2). 883.50/291.59 883.50/291.59 883.50/291.59 The TRS R consists of the following rules: 883.50/291.59 883.50/291.59 minus(x, y) -> cond(gt(x, y), x, y) 883.50/291.59 cond(false, x, y) -> 0 883.50/291.59 cond(true, x, y) -> s(minus(x, s(y))) 883.50/291.59 gt(0, v) -> false 883.50/291.59 gt(s(u), 0) -> true 883.50/291.59 gt(s(u), s(v)) -> gt(u, v) 883.50/291.59 883.50/291.59 S is empty. 883.50/291.59 Rewrite Strategy: INNERMOST 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (16) LowerBoundPropagationProof (FINISHED) 883.50/291.59 Propagated lower bound. 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (17) 883.50/291.59 BOUNDS(n^1, INF) 883.50/291.59 883.50/291.59 ---------------------------------------- 883.50/291.59 883.50/291.59 (18) 883.50/291.59 Obligation: 883.50/291.59 Analyzing the following TRS for decreasing loops: 883.50/291.59 883.50/291.59 The Runtime Complexity (innermost) of the given CpxTRS could be proven to be BOUNDS(n^1, n^2). 883.50/291.59 883.50/291.59 883.50/291.59 The TRS R consists of the following rules: 883.50/291.59 883.50/291.59 minus(x, y) -> cond(gt(x, y), x, y) 883.50/291.59 cond(false, x, y) -> 0 883.50/291.59 cond(true, x, y) -> s(minus(x, s(y))) 883.50/291.59 gt(0, v) -> false 883.50/291.59 gt(s(u), 0) -> true 883.50/291.59 gt(s(u), s(v)) -> gt(u, v) 883.50/291.59 883.50/291.59 S is empty. 883.50/291.59 Rewrite Strategy: INNERMOST 883.50/291.64 EOF