Initial Problem

Start: l0
Program_Vars: X₀, X₁, X₂
Temp_Vars:
Locations: l0, l1, l2
Transitions:
t₀: l0(X₀, X₁, X₂) → l1(X₀, X₁, X₁+1) :|: X₁ ≤ X₀ ∧ 1 ≤ X₀ ∧ 1 ≤ X₁
t₁: l1(X₀, X₁, X₂) → l2(X₀, X₁, X₂) :|: X₂+1 ≤ X₁
t₂: l1(X₀, X₁, X₂) → l2(X₀, X₁, X₂) :|: X₁+1 ≤ X₂
t₃: l2(X₀, X₁, X₂) → l1(X₀, X₁, 0) :|: 0 ≤ 1+X₀ ∧ 1 ≤ X₂ ∧ X₀+1 ≤ X₂
t₄: l2(X₀, X₁, X₂) → l1(X₀, X₁, X₂+1) :|: X₂ ≤ X₀ ∧ 0 ≤ 1+X₂

Preprocessing

Found invariant X₂ ≤ 1+X₀ ∧ 0 ≤ X₂ ∧ 1 ≤ X₁+X₂ ∧ 1 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀ for location l2

Found invariant X₂ ≤ 1+X₀ ∧ 0 ≤ X₂ ∧ 1 ≤ X₁+X₂ ∧ 1 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀ for location l1

Problem after Preprocessing

Start: l0
Program_Vars: X₀, X₁, X₂
Temp_Vars:
Locations: l0, l1, l2
Transitions:
t₀: l0(X₀, X₁, X₂) → l1(X₀, X₁, X₁+1) :|: X₁ ≤ X₀ ∧ 1 ≤ X₀ ∧ 1 ≤ X₁
t₁: l1(X₀, X₁, X₂) → l2(X₀, X₁, X₂) :|: X₂+1 ≤ X₁ ∧ X₂ ≤ 1+X₀ ∧ 0 ≤ X₂ ∧ 1 ≤ X₁+X₂ ∧ 1 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀
t₂: l1(X₀, X₁, X₂) → l2(X₀, X₁, X₂) :|: X₁+1 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 0 ≤ X₂ ∧ 1 ≤ X₁+X₂ ∧ 1 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀
t₃: l2(X₀, X₁, X₂) → l1(X₀, X₁, 0) :|: 0 ≤ 1+X₀ ∧ 1 ≤ X₂ ∧ X₀+1 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 0 ≤ X₂ ∧ 1 ≤ X₁+X₂ ∧ 1 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀
t₄: l2(X₀, X₁, X₂) → l1(X₀, X₁, X₂+1) :|: X₂ ≤ X₀ ∧ 0 ≤ 1+X₂ ∧ X₂ ≤ 1+X₀ ∧ 0 ≤ X₂ ∧ 1 ≤ X₁+X₂ ∧ 1 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀

Analysing control-flow refined program

Cut unsatisfiable transition t₅₁: n_l1___4→n_l2___2

Cut unreachable locations [n_l2___2] from the program graph

Found invariant X₂ ≤ 1+X₀ ∧ 3 ≤ X₂ ∧ 4 ≤ X₁+X₂ ∧ 2+X₁ ≤ X₂ ∧ 5 ≤ X₀+X₂ ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 3 ≤ X₀+X₁ ∧ 2 ≤ X₀ for location n_l1___6

Found invariant X₂ ≤ X₁ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 2 ≤ X₁+X₂ ∧ 2 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀ for location n_l1___4

Found invariant X₂ ≤ 0 ∧ 1+X₂ ≤ X₁ ∧ 1+X₂ ≤ X₀ ∧ 0 ≤ X₂ ∧ 1 ≤ X₁+X₂ ∧ 1 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀ for location n_l2___5

Found invariant X₂ ≤ 0 ∧ 1+X₂ ≤ X₁ ∧ 1+X₂ ≤ X₀ ∧ 0 ≤ X₂ ∧ 1 ≤ X₁+X₂ ∧ 1 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀ for location n_l1___7

Found invariant X₂ ≤ 1+X₀ ∧ 3 ≤ X₂ ∧ 4 ≤ X₁+X₂ ∧ 2+X₁ ≤ X₂ ∧ 5 ≤ X₀+X₂ ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 3 ≤ X₀+X₁ ∧ 2 ≤ X₀ for location n_l2___1

Found invariant 1+X₂ ≤ X₁ ∧ 1+X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 3 ≤ X₁+X₂ ∧ 3 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 2 ≤ X₁ ∧ 4 ≤ X₀+X₁ ∧ 2 ≤ X₀ for location n_l2___3

Found invariant X₂ ≤ 1+X₁ ∧ X₂ ≤ 1+X₀ ∧ 2 ≤ X₂ ∧ 3 ≤ X₁+X₂ ∧ 1+X₁ ≤ X₂ ∧ 3 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀ for location l1

Found invariant X₂ ≤ 1+X₁ ∧ X₂ ≤ 1+X₀ ∧ 2 ≤ X₂ ∧ 3 ≤ X₁+X₂ ∧ 1+X₁ ≤ X₂ ∧ 3 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀ for location n_l2___8

MPRF for transition t₅₃: n_l1___6(X₀, X₁, X₂) → n_l2___1(X₀, X₁, X₂) :|: X₁ ≤ X₀ ∧ 0 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 1+X₁ ≤ X₂ ∧ 1 ≤ X₁ ∧ 1 ≤ X₁ ∧ 1+X₁ ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 1 ≤ X₁ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 1 ≤ X₁ ∧ X₂ ≤ 1+X₀ ∧ 1+X₁ ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 3 ≤ X₂ ∧ 4 ≤ X₁+X₂ ∧ 2+X₁ ≤ X₂ ∧ 5 ≤ X₀+X₂ ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 3 ≤ X₀+X₁ ∧ 2 ≤ X₀ of depth 1:

new bound:

X₀+X₁+4 {O(n)}

MPRF:

n_l2___1 [X₀+1-X₂ ]
n_l1___6 [X₀+2-X₂ ]

MPRF for transition t₅₆: n_l2___1(X₀, X₁, X₂) → n_l1___6(X₀, X₁, X₂+1) :|: X₂ ≤ 1+X₀ ∧ 1+X₁ ≤ X₂ ∧ 1 ≤ X₁ ∧ X₂ ≤ X₀ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 0 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 3 ≤ X₂ ∧ 4 ≤ X₁+X₂ ∧ 2+X₁ ≤ X₂ ∧ 5 ≤ X₀+X₂ ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 3 ≤ X₀+X₁ ∧ 2 ≤ X₀ of depth 1:

new bound:

X₀+X₁+3 {O(n)}

MPRF:

n_l2___1 [X₀+1-X₂ ]
n_l1___6 [X₀+1-X₂ ]

MPRF for transition t₅₂: n_l1___4(X₀, X₁, X₂) → n_l2___3(X₀, X₁, X₂) :|: X₁ ≤ X₀ ∧ 0 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 1 ≤ X₁ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₁ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ X₁ ≤ X₀ ∧ 1+X₂ ≤ X₁ ∧ 0 ≤ X₂ ∧ X₂ ≤ X₁ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 2 ≤ X₁+X₂ ∧ 2 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀ of depth 1:

new bound:

2⋅X₀+2 {O(n)}

MPRF:

n_l2___3 [X₀-X₂ ]
n_l1___4 [X₀+1-X₂ ]

MPRF for transition t₅₉: n_l2___3(X₀, X₁, X₂) → n_l1___4(X₀, X₁, X₂+1) :|: X₁ ≤ X₀ ∧ 1+X₂ ≤ X₁ ∧ 1 ≤ X₂ ∧ X₂ ≤ X₀ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 0 ≤ X₂ ∧ 1+X₂ ≤ X₁ ∧ 1+X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 3 ≤ X₁+X₂ ∧ 3 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 2 ≤ X₁ ∧ 4 ≤ X₀+X₁ ∧ 2 ≤ X₀ of depth 1:

new bound:

2⋅X₀+2 {O(n)}

MPRF:

n_l2___3 [X₀+1-X₂ ]
n_l1___4 [X₀+1-X₂ ]

CFR: Improvement to new bound with the following program:

new bound:

2⋅X₁+6⋅X₀+11 {O(n)}

cfr-program:

Start: l0
Program_Vars: X₀, X₁, X₂
Temp_Vars:
Locations: l0, l1, n_l1___4, n_l1___6, n_l1___7, n_l2___1, n_l2___3, n_l2___5, n_l2___8
Transitions:
t₀: l0(X₀, X₁, X₂) → l1(X₀, X₁, X₁+1) :|: X₁ ≤ X₀ ∧ 1 ≤ X₀ ∧ 1 ≤ X₁
t₅₅: l1(X₀, X₁, X₂) → n_l2___8(X₀, X₁, X₂) :|: X₁ ≤ X₀ ∧ 0 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 1+X₁ ≤ X₂ ∧ 1 ≤ X₁ ∧ 1+X₁ ≤ X₂ ∧ X₂ ≤ 1+X₁ ∧ 2 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 1 ≤ X₁ ∧ 1+X₁ ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 1 ≤ X₁ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 1 ≤ X₁ ∧ X₂ ≤ 1+X₀ ∧ 1+X₁ ≤ X₂ ∧ X₂ ≤ 1+X₁ ∧ X₂ ≤ 1+X₀ ∧ 2 ≤ X₂ ∧ 3 ≤ X₁+X₂ ∧ 1+X₁ ≤ X₂ ∧ 3 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀
t₅₂: n_l1___4(X₀, X₁, X₂) → n_l2___3(X₀, X₁, X₂) :|: X₁ ≤ X₀ ∧ 0 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 1 ≤ X₁ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₁ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ X₁ ≤ X₀ ∧ 1+X₂ ≤ X₁ ∧ 0 ≤ X₂ ∧ X₂ ≤ X₁ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 2 ≤ X₁+X₂ ∧ 2 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀
t₅₃: n_l1___6(X₀, X₁, X₂) → n_l2___1(X₀, X₁, X₂) :|: X₁ ≤ X₀ ∧ 0 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 1+X₁ ≤ X₂ ∧ 1 ≤ X₁ ∧ 1 ≤ X₁ ∧ 1+X₁ ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 1 ≤ X₁ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 1 ≤ X₁ ∧ X₂ ≤ 1+X₀ ∧ 1+X₁ ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 3 ≤ X₂ ∧ 4 ≤ X₁+X₂ ∧ 2+X₁ ≤ X₂ ∧ 5 ≤ X₀+X₂ ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 3 ≤ X₀+X₁ ∧ 2 ≤ X₀
t₅₄: n_l1___7(X₀, X₁, X₂) → n_l2___5(X₀, X₁, X₂) :|: X₁ ≤ X₀ ∧ 1+X₂ ≤ X₁ ∧ 0 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 1 ≤ X₁ ∧ X₂ ≤ X₀ ∧ 0 ≤ X₂ ∧ 1+X₂ ≤ X₁ ∧ X₁ ≤ X₀ ∧ X₂ ≤ 0 ∧ 0 ≤ X₂ ∧ 1 ≤ X₁ ∧ X₁ ≤ X₀ ∧ X₁ ≤ X₀ ∧ 1+X₂ ≤ X₁ ∧ 0 ≤ X₂ ∧ X₂ ≤ 0 ∧ 1+X₂ ≤ X₁ ∧ 1+X₂ ≤ X₀ ∧ 0 ≤ X₂ ∧ 1 ≤ X₁+X₂ ∧ 1 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀
t₅₆: n_l2___1(X₀, X₁, X₂) → n_l1___6(X₀, X₁, X₂+1) :|: X₂ ≤ 1+X₀ ∧ 1+X₁ ≤ X₂ ∧ 1 ≤ X₁ ∧ X₂ ≤ X₀ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 0 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ 3 ≤ X₂ ∧ 4 ≤ X₁+X₂ ∧ 2+X₁ ≤ X₂ ∧ 5 ≤ X₀+X₂ ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 3 ≤ X₀+X₁ ∧ 2 ≤ X₀
t₅₇: n_l2___1(X₀, X₁, X₂) → n_l1___7(X₀, X₁, 0) :|: X₂ ≤ 1+X₀ ∧ 1+X₁ ≤ X₂ ∧ 1 ≤ X₁ ∧ 1 ≤ X₁ ∧ X₁ ≤ X₀ ∧ X₀+1 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ X₂ ≤ 1+X₀ ∧ 3 ≤ X₂ ∧ 4 ≤ X₁+X₂ ∧ 2+X₁ ≤ X₂ ∧ 5 ≤ X₀+X₂ ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 3 ≤ X₀+X₁ ∧ 2 ≤ X₀
t₅₉: n_l2___3(X₀, X₁, X₂) → n_l1___4(X₀, X₁, X₂+1) :|: X₁ ≤ X₀ ∧ 1+X₂ ≤ X₁ ∧ 1 ≤ X₂ ∧ X₂ ≤ X₀ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 0 ≤ X₂ ∧ 1+X₂ ≤ X₁ ∧ 1+X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 3 ≤ X₁+X₂ ∧ 3 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 2 ≤ X₁ ∧ 4 ≤ X₀+X₁ ∧ 2 ≤ X₀
t₆₀: n_l2___5(X₀, X₁, X₂) → n_l1___4(X₀, X₁, X₂+1) :|: X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ X₂ ≤ 0 ∧ 0 ≤ X₂ ∧ X₂ ≤ X₀ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 0 ≤ X₂ ∧ X₂ ≤ 0 ∧ 1+X₂ ≤ X₁ ∧ 1+X₂ ≤ X₀ ∧ 0 ≤ X₂ ∧ 1 ≤ X₁+X₂ ∧ 1 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀
t₆₁: n_l2___8(X₀, X₁, X₂) → n_l1___6(X₀, X₁, X₂+1) :|: X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ X₁+1 ≤ X₂ ∧ X₂ ≤ 1+X₁ ∧ X₂ ≤ X₀ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 0 ≤ X₂ ∧ X₂ ≤ 1+X₁ ∧ X₂ ≤ 1+X₀ ∧ 2 ≤ X₂ ∧ 3 ≤ X₁+X₂ ∧ 1+X₁ ≤ X₂ ∧ 3 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀
t₆₂: n_l2___8(X₀, X₁, X₂) → n_l1___7(X₀, X₁, 0) :|: X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ X₁+1 ≤ X₂ ∧ X₂ ≤ 1+X₁ ∧ 1 ≤ X₁ ∧ X₁ ≤ X₀ ∧ X₀+1 ≤ X₂ ∧ X₂ ≤ 1+X₀ ∧ X₂ ≤ 1+X₁ ∧ X₂ ≤ 1+X₀ ∧ 2 ≤ X₂ ∧ 3 ≤ X₁+X₂ ∧ 1+X₁ ≤ X₂ ∧ 3 ≤ X₀+X₂ ∧ X₁ ≤ X₀ ∧ 1 ≤ X₁ ∧ 2 ≤ X₀+X₁ ∧ 1 ≤ X₀

All Bounds

Timebounds

Overall timebound:2⋅X₁+6⋅X₀+18 {O(n)}
t₀: 1 {O(1)}
t₅₅: 1 {O(1)}
t₅₂: 2⋅X₀+2 {O(n)}
t₅₃: X₀+X₁+4 {O(n)}
t₅₄: 1 {O(1)}
t₅₆: X₀+X₁+3 {O(n)}
t₅₇: 1 {O(1)}
t₅₉: 2⋅X₀+2 {O(n)}
t₆₀: 1 {O(1)}
t₆₁: 1 {O(1)}
t₆₂: 1 {O(1)}

Costbounds

Overall costbound: 2⋅X₁+6⋅X₀+18 {O(n)}
t₀: 1 {O(1)}
t₅₅: 1 {O(1)}
t₅₂: 2⋅X₀+2 {O(n)}
t₅₃: X₀+X₁+4 {O(n)}
t₅₄: 1 {O(1)}
t₅₆: X₀+X₁+3 {O(n)}
t₅₇: 1 {O(1)}
t₅₉: 2⋅X₀+2 {O(n)}
t₆₀: 1 {O(1)}
t₆₁: 1 {O(1)}
t₆₂: 1 {O(1)}

Sizebounds

t₀, X₀: X₀ {O(n)}
t₀, X₁: X₁ {O(n)}
t₀, X₂: X₁+1 {O(n)}
t₅₅, X₀: X₀ {O(n)}
t₅₅, X₁: X₁ {O(n)}
t₅₅, X₂: X₁+1 {O(n)}
t₅₂, X₀: 2⋅X₀ {O(n)}
t₅₂, X₁: 2⋅X₁ {O(n)}
t₅₂, X₂: 2⋅X₀+3 {O(n)}
t₅₃, X₀: X₀ {O(n)}
t₅₃, X₁: X₁ {O(n)}
t₅₃, X₂: 2⋅X₁+X₀+5 {O(n)}
t₅₄, X₀: 2⋅X₀ {O(n)}
t₅₄, X₁: 2⋅X₁ {O(n)}
t₅₄, X₂: 0 {O(1)}
t₅₆, X₀: X₀ {O(n)}
t₅₆, X₁: X₁ {O(n)}
t₅₆, X₂: 2⋅X₁+X₀+5 {O(n)}
t₅₇, X₀: X₀ {O(n)}
t₅₇, X₁: X₁ {O(n)}
t₅₇, X₂: 0 {O(1)}
t₅₉, X₀: 2⋅X₀ {O(n)}
t₅₉, X₁: 2⋅X₁ {O(n)}
t₅₉, X₂: 2⋅X₀+3 {O(n)}
t₆₀, X₀: 2⋅X₀ {O(n)}
t₆₀, X₁: 2⋅X₁ {O(n)}
t₆₀, X₂: 1 {O(1)}
t₆₁, X₀: X₀ {O(n)}
t₆₁, X₁: X₁ {O(n)}
t₆₁, X₂: X₁+2 {O(n)}
t₆₂, X₀: X₀ {O(n)}
t₆₂, X₁: X₁ {O(n)}
t₆₂, X₂: 0 {O(1)}