This page keeps track of what letter number combinations are currently well-written dis-ambiguation pages and which are not:
Alpha edit
A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A21 A22 A23 A24 A25 A26 A27 A28 A29 A30 A31 A32 A33 A34 A35 A36 A37 A38 A39 A40 A41 (currently a re-direct to A41 road)
Bravo edit
B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 B16 B17 B18 B19 B20 B21 (currently an article needing cleanup)
Charlie edit
C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 (currently a re-direct to C-17 Globemaster III)
Delta edit
Echo edit
E1 E2 E3 E4 E5 E6 E7 E8 E9 E10 E11 E12 E13 E14 E15 E16 E17 E18 E19 (currently does not exist)
Foxtrot edit
F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 (currently a re-direct to F3D Skyknight)
Golf edit
G1 G2 G3 G4 G5 G6 G7 G8 G9 G10 G11 G12 G13 (currently a re-direct to G-13)
Hotel edit
India edit
I1 (currently does not exist)
Juliet edit
J1 (currently does not exist)
Kilo edit
K1 K2 K3 K4 K5 K6 K7 K8 K9 K10 K11 (currently a re-direct to Svay Pak)
Lima edit
Mike edit
M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11 M12 M13 M14 M15 M16 M17 M18 M19 M20 M21 M22 M23 M24 M25 M26 M27 M28 M29 M30 M31 M32 M33 M34 (currently a re-direct to Open Cluster M34)
November edit
N1 N2 N3 N4 N5 N6 N7 N8 N9 N10 N11 N12 N13 N14 N15 N16 N17 N18 N19 N20 N21 N22 N23 (currently a re-direct to N23 road)
Oscar edit
Peachtree edit
Quebec edit
Q1 Q2 Q3 Q4 Q5 Q6 Q7 (currently a re-direct to Q (TV series))
Romeo edit
R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 (currently a re-direct to R-16)
Sierra edit
S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 (currently a re-direct to List of S-phrases)
Tango edit
T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13 (currently does not exist)
Uniform edit
Victor edit
Whiskey edit
W1 W2 W3 W4 (currently a re-direct to Mark 4 nuclear bomb)
X ray edit
Yankee edit
Y1 Y2 (currently a re-direct to Boeing 787)
Zulu edit
Total Count edit
274 out of 2574 possible dis-ambiguation pages are linked to here