Most recent use of each letter noted.
A
April 2020, Sept. 2020, Nov. 2020, Dec. 2020, Jan. 2021, Feb. 2021, June 2021, Sept. 2021, Feb. 2022, July 2022, Aug. 2022
B
Aug. 2020, Oct. 2020, Nov. 2020, Jan. 2021, April 2021, May 2021, July 2021, Oct. 2021, Jan. 2022, Feb. 2022, June 2022
C
Aug. 2020, Oct. 2020, Nov. 2020, Jan. 2021, Feb. 2021, April 2021, July 2021, Oct. 2021, March 2022, July 2022, Sept. 2022
D
May 2020, Sept. 2020, Nov. 2020, Feb. 2021, March 2021, June 2021, Oct. 2021, Nov. 2021, March 2022, May 2022, Oct. 2022
E
July 2020, Oct. 2020, Dec. 2020, March 2021 (twice), June 2021, Oct. 2021, May 2022
F
April 2020, Sept. 2020, Dec. 2020, Feb. 2021, May 2021, Aug. 2021, Dec. 2021, April 2022, Aug. 2022
G
Aug. 2020, Oct. 2020, Nov. 2020, Jan. 2021 (twice), May 2021, Sept. 2021, Dec. 2021, May 2022, Aug. 2022
H
May 2020, Sept. 2020, Oct. 2020, Feb. 2021, April 2021, June 2021, Aug. 2021, Oct. 2021, April 2022, Sept. 2022
I
July 2020, Dec. 2020, April 2021, May 2021, Sept. 2021, April 2022, Sept. 2022
J
Jan. 2020, Aug. 2020, Oct. 2020, Jan. 2021, June 2021, Aug. 2021, Dec. 2021, Jan. 2022, May 2022
K
July 2020, Nov. 2020, Feb. 2021, April 2021, June 2021, Oct. 2021, Nov. 2021, April 2022, Aug. 2022, Sept. 2022
L
June 2020, Oct. 2020 (twice), Dec. 2020, April 2021, June 2021, Aug. 2021, Nov. 2021, May 2022, July 2022
M
Aug. 2020, Nov. 2020, Jan. 2021, April 2021, May 2021, Aug. 2021, Nov. 2021, March 2022, April 2022
N
May 2020, Sept. 2020, Dec. 2020, March 2021, June 2021, Jan. 2022, June 2022
O
June 2020, Oct. 2020, Dec. 2020, April 2021, July 2021, Sept. 2021, Feb. 2022, July 2022
P
Aug. 2020, Oct. 2020, Jan. 2021, Feb. 2021, May 2021, Aug. 2021, Nov. 2021, Feb. 2022, July 2022, Aug. 2022
Q
June 2020, Oct. 2020, April 2021, July 2021, May 2022
R
Jan. 2020, Sept. 2020, Nov. 2020, Jan. 2021 (twice), May 2021, June 2021, Sept. 2021, Nov. 2021, March 2022, July 2022
S
July 2020, Sept. 2020, Oct. 2020 (twice), Nov. 2020, Jan. 2021, May 2021, Aug. 2021, Dec. 2021, Jan. 2022, April 2022
T
Aug. 2020, Nov. 2020, Dec. 2020, Jan. 2021, May 2021, July 2021, Oct. 2021, Jan. 2022, June 2022
U
Feb. 2020, Nov. 2020, March 2021, June 2021, Oct. 2021, June 2022
V
Feb. 2020, Aug. 2020, Dec. 2020, March 2021, July 2021, Feb. 2022
W
March 2020, Sept. 2020, Dec. 2020, March 2021, May 2021, Aug. 2021, Nov. 2021, March 2022, Sept. 2022
X
July 2020, June 2021, Sept. 2021, Aug. 2022
Y
April 2020, Aug. 2020, March 2021, June 2021, Feb. 2022, Aug. 2022
Z
May 2020, Oct. 2020, Jan. 2021, March 2021, July 2021, Oct. 2021, June 2022
(As of Oct. 2022 thread, post 1)