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Theorem bccolsum 36252
Description: A column-sum rule for binomial coefficients. (Contributed by Scott Fenton, 24-Jun-2020.)
Assertion
Ref Expression
bccolsum ((𝑁 ∈ ℕ0𝐶 ∈ ℕ0) → Σ𝑘 ∈ (0...𝑁)(𝑘C𝐶) = ((𝑁 + 1)C(𝐶 + 1)))
Distinct variable groups:   𝑘,𝑁   𝐶,𝑘

Proof of Theorem bccolsum
Dummy variables 𝑛 𝑚 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 oveq2 7431 . . . . . 6 (𝑚 = 0 → (0...𝑚) = (0...0))
21sumeq1d 15777 . . . . 5 (𝑚 = 0 → Σ𝑘 ∈ (0...𝑚)(𝑘C𝐶) = Σ𝑘 ∈ (0...0)(𝑘C𝐶))
3 oveq1 7430 . . . . . . 7 (𝑚 = 0 → (𝑚 + 1) = (0 + 1))
4 0p1e1 12379 . . . . . . 7 (0 + 1) = 1
53, 4eqtrdi 2817 . . . . . 6 (𝑚 = 0 → (𝑚 + 1) = 1)
65oveq1d 7438 . . . . 5 (𝑚 = 0 → ((𝑚 + 1)C(𝐶 + 1)) = (1C(𝐶 + 1)))
72, 6eqeq12d 2782 . . . 4 (𝑚 = 0 → (Σ𝑘 ∈ (0...𝑚)(𝑘C𝐶) = ((𝑚 + 1)C(𝐶 + 1)) ↔ Σ𝑘 ∈ (0...0)(𝑘C𝐶) = (1C(𝐶 + 1))))
87imbi2d 343 . . 3 (𝑚 = 0 → ((𝐶 ∈ ℕ0 → Σ𝑘 ∈ (0...𝑚)(𝑘C𝐶) = ((𝑚 + 1)C(𝐶 + 1))) ↔ (𝐶 ∈ ℕ0 → Σ𝑘 ∈ (0...0)(𝑘C𝐶) = (1C(𝐶 + 1)))))
9 oveq2 7431 . . . . . 6 (𝑚 = 𝑛 → (0...𝑚) = (0...𝑛))
109sumeq1d 15777 . . . . 5 (𝑚 = 𝑛 → Σ𝑘 ∈ (0...𝑚)(𝑘C𝐶) = Σ𝑘 ∈ (0...𝑛)(𝑘C𝐶))
11 oveq1 7430 . . . . . 6 (𝑚 = 𝑛 → (𝑚 + 1) = (𝑛 + 1))
1211oveq1d 7438 . . . . 5 (𝑚 = 𝑛 → ((𝑚 + 1)C(𝐶 + 1)) = ((𝑛 + 1)C(𝐶 + 1)))
1310, 12eqeq12d 2782 . . . 4 (𝑚 = 𝑛 → (Σ𝑘 ∈ (0...𝑚)(𝑘C𝐶) = ((𝑚 + 1)C(𝐶 + 1)) ↔ Σ𝑘 ∈ (0...𝑛)(𝑘C𝐶) = ((𝑛 + 1)C(𝐶 + 1))))
1413imbi2d 343 . . 3 (𝑚 = 𝑛 → ((𝐶 ∈ ℕ0 → Σ𝑘 ∈ (0...𝑚)(𝑘C𝐶) = ((𝑚 + 1)C(𝐶 + 1))) ↔ (𝐶 ∈ ℕ0 → Σ𝑘 ∈ (0...𝑛)(𝑘C𝐶) = ((𝑛 + 1)C(𝐶 + 1)))))
15 oveq2 7431 . . . . . 6 (𝑚 = (𝑛 + 1) → (0...𝑚) = (0...(𝑛 + 1)))
1615sumeq1d 15777 . . . . 5 (𝑚 = (𝑛 + 1) → Σ𝑘 ∈ (0...𝑚)(𝑘C𝐶) = Σ𝑘 ∈ (0...(𝑛 + 1))(𝑘C𝐶))
17 oveq1 7430 . . . . . 6 (𝑚 = (𝑛 + 1) → (𝑚 + 1) = ((𝑛 + 1) + 1))
1817oveq1d 7438 . . . . 5 (𝑚 = (𝑛 + 1) → ((𝑚 + 1)C(𝐶 + 1)) = (((𝑛 + 1) + 1)C(𝐶 + 1)))
1916, 18eqeq12d 2782 . . . 4 (𝑚 = (𝑛 + 1) → (Σ𝑘 ∈ (0...𝑚)(𝑘C𝐶) = ((𝑚 + 1)C(𝐶 + 1)) ↔ Σ𝑘 ∈ (0...(𝑛 + 1))(𝑘C𝐶) = (((𝑛 + 1) + 1)C(𝐶 + 1))))
2019imbi2d 343 . . 3 (𝑚 = (𝑛 + 1) → ((𝐶 ∈ ℕ0 → Σ𝑘 ∈ (0...𝑚)(𝑘C𝐶) = ((𝑚 + 1)C(𝐶 + 1))) ↔ (𝐶 ∈ ℕ0 → Σ𝑘 ∈ (0...(𝑛 + 1))(𝑘C𝐶) = (((𝑛 + 1) + 1)C(𝐶 + 1)))))
21 oveq2 7431 . . . . . 6 (𝑚 = 𝑁 → (0...𝑚) = (0...𝑁))
2221sumeq1d 15777 . . . . 5 (𝑚 = 𝑁 → Σ𝑘 ∈ (0...𝑚)(𝑘C𝐶) = Σ𝑘 ∈ (0...𝑁)(𝑘C𝐶))
23 oveq1 7430 . . . . . 6 (𝑚 = 𝑁 → (𝑚 + 1) = (𝑁 + 1))
2423oveq1d 7438 . . . . 5 (𝑚 = 𝑁 → ((𝑚 + 1)C(𝐶 + 1)) = ((𝑁 + 1)C(𝐶 + 1)))
2522, 24eqeq12d 2782 . . . 4 (𝑚 = 𝑁 → (Σ𝑘 ∈ (0...𝑚)(𝑘C𝐶) = ((𝑚 + 1)C(𝐶 + 1)) ↔ Σ𝑘 ∈ (0...𝑁)(𝑘C𝐶) = ((𝑁 + 1)C(𝐶 + 1))))
2625imbi2d 343 . . 3 (𝑚 = 𝑁 → ((𝐶 ∈ ℕ0 → Σ𝑘 ∈ (0...𝑚)(𝑘C𝐶) = ((𝑚 + 1)C(𝐶 + 1))) ↔ (𝐶 ∈ ℕ0 → Σ𝑘 ∈ (0...𝑁)(𝑘C𝐶) = ((𝑁 + 1)C(𝐶 + 1)))))
27 0z 12620 . . . . 5 0 ∈ ℤ
28 0nn0 12537 . . . . . . 7 0 ∈ ℕ0
29 nn0z 12633 . . . . . . 7 (𝐶 ∈ ℕ0𝐶 ∈ ℤ)
30 bccl 14378 . . . . . . 7 ((0 ∈ ℕ0𝐶 ∈ ℤ) → (0C𝐶) ∈ ℕ0)
3128, 29, 30sylancr 599 . . . . . 6 (𝐶 ∈ ℕ0 → (0C𝐶) ∈ ℕ0)
3231nn0cnd 12585 . . . . 5 (𝐶 ∈ ℕ0 → (0C𝐶) ∈ ℂ)
33 oveq1 7430 . . . . . 6 (𝑘 = 0 → (𝑘C𝐶) = (0C𝐶))
3433fsum1 15824 . . . . 5 ((0 ∈ ℤ ∧ (0C𝐶) ∈ ℂ) → Σ𝑘 ∈ (0...0)(𝑘C𝐶) = (0C𝐶))
3527, 32, 34sylancr 599 . . . 4 (𝐶 ∈ ℕ0 → Σ𝑘 ∈ (0...0)(𝑘C𝐶) = (0C𝐶))
36 elnn0 12524 . . . . 5 (𝐶 ∈ ℕ0 ↔ (𝐶 ∈ ℕ ∨ 𝐶 = 0))
37 1red 11227 . . . . . . . . . . 11 (𝐶 ∈ ℕ → 1 ∈ ℝ)
38 nnrp 13046 . . . . . . . . . . 11 (𝐶 ∈ ℕ → 𝐶 ∈ ℝ+)
3937, 38ltaddrp2d 13112 . . . . . . . . . 10 (𝐶 ∈ ℕ → 1 < (𝐶 + 1))
40 peano2nn 12263 . . . . . . . . . . . 12 (𝐶 ∈ ℕ → (𝐶 + 1) ∈ ℕ)
4140nnred 12266 . . . . . . . . . . 11 (𝐶 ∈ ℕ → (𝐶 + 1) ∈ ℝ)
4237, 41ltnled 11375 . . . . . . . . . 10 (𝐶 ∈ ℕ → (1 < (𝐶 + 1) ↔ ¬ (𝐶 + 1) ≤ 1))
4339, 42mpbid 235 . . . . . . . . 9 (𝐶 ∈ ℕ → ¬ (𝐶 + 1) ≤ 1)
44 elfzle2 13574 . . . . . . . . 9 ((𝐶 + 1) ∈ (0...1) → (𝐶 + 1) ≤ 1)
4543, 44nsyl 141 . . . . . . . 8 (𝐶 ∈ ℕ → ¬ (𝐶 + 1) ∈ (0...1))
4645iffalsed 4503 . . . . . . 7 (𝐶 ∈ ℕ → if((𝐶 + 1) ∈ (0...1), ((!‘1) / ((!‘(1 − (𝐶 + 1))) · (!‘(𝐶 + 1)))), 0) = 0)
47 1nn0 12538 . . . . . . . 8 1 ∈ ℕ0
4840nnzd 12635 . . . . . . . 8 (𝐶 ∈ ℕ → (𝐶 + 1) ∈ ℤ)
49 bcval 14360 . . . . . . . 8 ((1 ∈ ℕ0 ∧ (𝐶 + 1) ∈ ℤ) → (1C(𝐶 + 1)) = if((𝐶 + 1) ∈ (0...1), ((!‘1) / ((!‘(1 − (𝐶 + 1))) · (!‘(𝐶 + 1)))), 0))
5047, 48, 49sylancr 599 . . . . . . 7 (𝐶 ∈ ℕ → (1C(𝐶 + 1)) = if((𝐶 + 1) ∈ (0...1), ((!‘1) / ((!‘(1 − (𝐶 + 1))) · (!‘(𝐶 + 1)))), 0))
51 bc0k 14367 . . . . . . 7 (𝐶 ∈ ℕ → (0C𝐶) = 0)
5246, 50, 513eqtr4rd 2812 . . . . . 6 (𝐶 ∈ ℕ → (0C𝐶) = (1C(𝐶 + 1)))
53 bcnn 14368 . . . . . . . . 9 (0 ∈ ℕ0 → (0C0) = 1)
5428, 53ax-mp 5 . . . . . . . 8 (0C0) = 1
55 bcnn 14368 . . . . . . . . 9 (1 ∈ ℕ0 → (1C1) = 1)
5647, 55ax-mp 5 . . . . . . . 8 (1C1) = 1
5754, 56eqtr4i 2792 . . . . . . 7 (0C0) = (1C1)
58 oveq2 7431 . . . . . . 7 (𝐶 = 0 → (0C𝐶) = (0C0))
59 oveq1 7430 . . . . . . . . 9 (𝐶 = 0 → (𝐶 + 1) = (0 + 1))
6059, 4eqtrdi 2817 . . . . . . . 8 (𝐶 = 0 → (𝐶 + 1) = 1)
6160oveq2d 7439 . . . . . . 7 (𝐶 = 0 → (1C(𝐶 + 1)) = (1C1))
6257, 58, 613eqtr4a 2827 . . . . . 6 (𝐶 = 0 → (0C𝐶) = (1C(𝐶 + 1)))
6352, 62jaoi 871 . . . . 5 ((𝐶 ∈ ℕ ∨ 𝐶 = 0) → (0C𝐶) = (1C(𝐶 + 1)))
6436, 63sylbi 220 . . . 4 (𝐶 ∈ ℕ0 → (0C𝐶) = (1C(𝐶 + 1)))
6535, 64eqtrd 2801 . . 3 (𝐶 ∈ ℕ0 → Σ𝑘 ∈ (0...0)(𝑘C𝐶) = (1C(𝐶 + 1)))
66 elnn0uz 12921 . . . . . . . . 9 (𝑛 ∈ ℕ0𝑛 ∈ (ℤ‘0))
6766birani 509 . . . . . . . 8 ((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) → 𝑛 ∈ (ℤ‘0))
68 elfznn0 13667 . . . . . . . . . . 11 (𝑘 ∈ (0...(𝑛 + 1)) → 𝑘 ∈ ℕ0)
6968adantl 487 . . . . . . . . . 10 (((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) ∧ 𝑘 ∈ (0...(𝑛 + 1))) → 𝑘 ∈ ℕ0)
70 simplr 781 . . . . . . . . . . 11 (((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) ∧ 𝑘 ∈ (0...(𝑛 + 1))) → 𝐶 ∈ ℕ0)
7170nn0zd 12634 . . . . . . . . . 10 (((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) ∧ 𝑘 ∈ (0...(𝑛 + 1))) → 𝐶 ∈ ℤ)
72 bccl 14378 . . . . . . . . . 10 ((𝑘 ∈ ℕ0𝐶 ∈ ℤ) → (𝑘C𝐶) ∈ ℕ0)
7369, 71, 72syl2anc 596 . . . . . . . . 9 (((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) ∧ 𝑘 ∈ (0...(𝑛 + 1))) → (𝑘C𝐶) ∈ ℕ0)
7473nn0cnd 12585 . . . . . . . 8 (((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) ∧ 𝑘 ∈ (0...(𝑛 + 1))) → (𝑘C𝐶) ∈ ℂ)
75 oveq1 7430 . . . . . . . 8 (𝑘 = (𝑛 + 1) → (𝑘C𝐶) = ((𝑛 + 1)C𝐶))
7667, 74, 75fsump1 15833 . . . . . . 7 ((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) → Σ𝑘 ∈ (0...(𝑛 + 1))(𝑘C𝐶) = (Σ𝑘 ∈ (0...𝑛)(𝑘C𝐶) + ((𝑛 + 1)C𝐶)))
7776adantr 486 . . . . . 6 (((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) ∧ Σ𝑘 ∈ (0...𝑛)(𝑘C𝐶) = ((𝑛 + 1)C(𝐶 + 1))) → Σ𝑘 ∈ (0...(𝑛 + 1))(𝑘C𝐶) = (Σ𝑘 ∈ (0...𝑛)(𝑘C𝐶) + ((𝑛 + 1)C𝐶)))
78 id 23 . . . . . . 7 𝑘 ∈ (0...𝑛)(𝑘C𝐶) = ((𝑛 + 1)C(𝐶 + 1)) → Σ𝑘 ∈ (0...𝑛)(𝑘C𝐶) = ((𝑛 + 1)C(𝐶 + 1)))
79 nn0cn 12532 . . . . . . . . . . 11 (𝐶 ∈ ℕ0𝐶 ∈ ℂ)
8079adantl 487 . . . . . . . . . 10 ((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) → 𝐶 ∈ ℂ)
81 1cnd 11220 . . . . . . . . . 10 ((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) → 1 ∈ ℂ)
8280, 81pncand 11588 . . . . . . . . 9 ((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) → ((𝐶 + 1) − 1) = 𝐶)
8382oveq2d 7439 . . . . . . . 8 ((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) → ((𝑛 + 1)C((𝐶 + 1) − 1)) = ((𝑛 + 1)C𝐶))
8483eqcomd 2772 . . . . . . 7 ((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) → ((𝑛 + 1)C𝐶) = ((𝑛 + 1)C((𝐶 + 1) − 1)))
8578, 84oveqan12rd 7443 . . . . . 6 (((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) ∧ Σ𝑘 ∈ (0...𝑛)(𝑘C𝐶) = ((𝑛 + 1)C(𝐶 + 1))) → (Σ𝑘 ∈ (0...𝑛)(𝑘C𝐶) + ((𝑛 + 1)C𝐶)) = (((𝑛 + 1)C(𝐶 + 1)) + ((𝑛 + 1)C((𝐶 + 1) − 1))))
86 peano2nn0 12562 . . . . . . . 8 (𝑛 ∈ ℕ0 → (𝑛 + 1) ∈ ℕ0)
87 peano2nn0 12562 . . . . . . . . 9 (𝐶 ∈ ℕ0 → (𝐶 + 1) ∈ ℕ0)
8887nn0zd 12634 . . . . . . . 8 (𝐶 ∈ ℕ0 → (𝐶 + 1) ∈ ℤ)
89 bcpasc 14377 . . . . . . . 8 (((𝑛 + 1) ∈ ℕ0 ∧ (𝐶 + 1) ∈ ℤ) → (((𝑛 + 1)C(𝐶 + 1)) + ((𝑛 + 1)C((𝐶 + 1) − 1))) = (((𝑛 + 1) + 1)C(𝐶 + 1)))
9086, 88, 89syl2an 608 . . . . . . 7 ((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) → (((𝑛 + 1)C(𝐶 + 1)) + ((𝑛 + 1)C((𝐶 + 1) − 1))) = (((𝑛 + 1) + 1)C(𝐶 + 1)))
9190adantr 486 . . . . . 6 (((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) ∧ Σ𝑘 ∈ (0...𝑛)(𝑘C𝐶) = ((𝑛 + 1)C(𝐶 + 1))) → (((𝑛 + 1)C(𝐶 + 1)) + ((𝑛 + 1)C((𝐶 + 1) − 1))) = (((𝑛 + 1) + 1)C(𝐶 + 1)))
9277, 85, 913eqtrd 2805 . . . . 5 (((𝑛 ∈ ℕ0𝐶 ∈ ℕ0) ∧ Σ𝑘 ∈ (0...𝑛)(𝑘C𝐶) = ((𝑛 + 1)C(𝐶 + 1))) → Σ𝑘 ∈ (0...(𝑛 + 1))(𝑘C𝐶) = (((𝑛 + 1) + 1)C(𝐶 + 1)))
9392exp31 425 . . . 4 (𝑛 ∈ ℕ0 → (𝐶 ∈ ℕ0 → (Σ𝑘 ∈ (0...𝑛)(𝑘C𝐶) = ((𝑛 + 1)C(𝐶 + 1)) → Σ𝑘 ∈ (0...(𝑛 + 1))(𝑘C𝐶) = (((𝑛 + 1) + 1)C(𝐶 + 1)))))
9493a2d 30 . . 3 (𝑛 ∈ ℕ0 → ((𝐶 ∈ ℕ0 → Σ𝑘 ∈ (0...𝑛)(𝑘C𝐶) = ((𝑛 + 1)C(𝐶 + 1))) → (𝐶 ∈ ℕ0 → Σ𝑘 ∈ (0...(𝑛 + 1))(𝑘C𝐶) = (((𝑛 + 1) + 1)C(𝐶 + 1)))))
958, 14, 20, 26, 65, 94nn0ind 12709 . 2 (𝑁 ∈ ℕ0 → (𝐶 ∈ ℕ0 → Σ𝑘 ∈ (0...𝑁)(𝑘C𝐶) = ((𝑁 + 1)C(𝐶 + 1))))
9695imp 412 1 ((𝑁 ∈ ℕ0𝐶 ∈ ℕ0) → Σ𝑘 ∈ (0...𝑁)(𝑘C𝐶) = ((𝑁 + 1)C(𝐶 + 1)))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3  wi 4  wa 401  wo 861   = wceq 1570  wcel 2146  ifcif 4492   class class class wbr 5114  cfv 6543  (class class class)co 7423  cc 11116  0cc0 11118  1c1 11119   + caddc 11121   · cmul 11123   < clt 11261  cle 11262  cmin 11459   / cdiv 11889  cn 12251  0cn0 12522  cz 12609  cuz 12880  ...cfz 13553  !cfa 14329  Ccbc 14358  Σcsu 15763
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2738  ax-rep 5243  ax-sep 5262  ax-nul 5274  ax-pow 5341  ax-pr 5409  ax-un 7745  ax-inf2 9620  ax-cnex 11174  ax-resscn 11175  ax-1cn 11176  ax-icn 11177  ax-addcl 11178  ax-addrcl 11179  ax-mulcl 11180  ax-mulrcl 11181  ax-mulcom 11182  ax-addass 11183  ax-mulass 11184  ax-distr 11185  ax-i2m1 11186  ax-1ne0 11187  ax-1rid 11188  ax-rnegex 11189  ax-rrecex 11190  ax-cnre 11191  ax-pre-lttri 11192  ax-pre-lttrn 11193  ax-pre-ltadd 11194  ax-pre-mulgt0 11195  ax-pre-sup 11196
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2570  df-eu 2600  df-clab 2745  df-cleq 2758  df-clel 2841  df-nfc 2915  df-ne 2962  df-nel 3068  df-ral 3083  df-rex 3093  df-rmo 3372  df-reu 3373  df-rab 3420  df-v 3460  df-sbc 3748  df-csb 3857  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-pss 3928  df-nul 4290  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4878  df-int 4918  df-iun 4963  df-br 5115  df-opab 5179  df-mpt 5198  df-tr 5224  df-id 5561  df-eprel 5566  df-po 5574  df-so 5575  df-fr 5619  df-se 5620  df-we 5621  df-xp 5672  df-rel 5673  df-cnv 5674  df-co 5675  df-dm 5676  df-rn 5677  df-res 5678  df-ima 5679  df-pred 6309  df-ord 6370  df-on 6371  df-lim 6372  df-suc 6373  df-iota 6499  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548  df-fo 6549  df-f1o 6550  df-fv 6551  df-isom 6552  df-riota 7380  df-ov 7426  df-oprab 7427  df-mpo 7428  df-om 7872  df-1st 7995  df-2nd 7996  df-frecs 8287  df-wrecs 8318  df-recs 8367  df-rdg 8406  df-1o 8462  df-er 8703  df-en 8953  df-dom 8954  df-sdom 8955  df-fin 8956  df-sup 9412  df-oi 9482  df-card 9944  df-pnf 11263  df-mnf 11264  df-xr 11265  df-ltxr 11266  df-le 11267  df-sub 11461  df-neg 11462  df-div 11890  df-nn 12252  df-2 12321  df-3 12322  df-n0 12523  df-z 12610  df-uz 12881  df-rp 13035  df-fz 13554  df-fzo 13702  df-seq 14058  df-exp 14118  df-fac 14330  df-bc 14359  df-hash 14387  df-cj 15176  df-re 15177  df-im 15178  df-sqrt 15312  df-abs 15313  df-clim 15565  df-sum 15764
This theorem is used by: (None)
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