1: A-G, K, P, S-X, AB, AE-AK
2: A, G, I-K, N, P, R, T, X, AB-AC, AE, AK
3: A, C-E, G, I, O, Q-R, T, X, AC, AE, AG-AI, AK
4: A, C-E, G, J, M, O, P, T-U, W, AA-AB, AE, AG-AI, AK
5: A, C-E, G, I-K, M-R, X, Y, Z, AB, AE, AG-AI, AK
6: A, G, I, K, M-N, P, S-T, Z, AB-AC, AE, AK
7: A-G, I, K, M, O, Q, S, U, W, Y, AA, AC, AE-AK
8: I, K-L, O, Q, U-V, X, AA-AB
9: A-B, D, G-H, L-N, Q-R, T, V, X-AA, AC, AE-AG, AI-AJ
10: A, D, H-J, L-N, Q, T, V, AA, AC-AE, AH, AJ-AK
11: A-H, L-O, R-S, AA, AD, AG, AH, AJ-AK
12: A, E, J, L-P, R, T-X, Z-AB, AD-AF, AK
13: B, E, G J-L, N, Q, T-V, Z, AB-AF, AH, AK
14: A, D-E, L, N, Q-R, T-V, Y-AA, AE-AF, AI, AK
15: A-E, G-H, J, L, N-O, R-S, X, Z, AC, AE, AI, AK
16: A-F, I, K-L, N-Q, T, V, X, Z, AB-AC, AF, AK
17: C-D, G-I, K, M, R-T, V-Y, AC, AE-AF, AH-AK
18: A, D, F, H, M-O, Q-R, U-V, X-Y, AA, AC, AE-AG, AK
19: A, C-D, G-H, J, L-N, Q, S, U, Y, AC, AE, AG-AK
20: B, D, J, M, P-Q, T-V, X, AB-AD, AF-AG, AI-AK
21: A-B, F-H, J-K, M-N, P-R, U-V, X-AA, AC, AE, AG
22: A, C-D, F, I-L, N, Q, U-V, Z, AD-AE, AI-AK
23: A-B, D, F-G, K-O, T-U, W, Z, AE, AJ-AK
24: A, D, F, H, J, L-Q, S, V, Y-Z, AB-AG, AJ-AK
25: A-B, G, I, L-N, S-T, V-W, Y-AA, AC-AF, AJ
26: B, E, H, J-K, R, U-W, Y, AD-AF, AH-AK
27: A, G-I, K-M, Q, S, W-Y, AG-AI, AK
28: B-E, H, M-P, R, T-U, X, Z-AC, AE, AG, AK
29: A-C, F-H, K-M, O, T-U, W-Y, AA, AC-AI, AK
30: I, L-O, T, V-AC, AG
31: A-G, I-K, O-Q, V, AA-AC, AE, AG, AI-AK
32: A, G, K, M, P, R, V-W, AC, AG, AI-AJ
33: A, C-E, G, J-O, R-S, V, X-Y, AA, AC-AG, AJ
34: A, C-E, G, I-K, M-O, Q-T, Y-Z, AB-AC, AF-AI, AK
35: A, C-E, G, K, O, Q-R, T, V, AA-AB, AG-AH, AK
36: A, G, I, N, P, U, W, Z, AC-AE
37: A-G, I-N, Q-R, T-U, Y-AB, AE-AF, AJ-AK

You can validate your puzzle solution with certitude.