Case 1:

RADAR

Case 2:

AMA
ATA

Case 3:

A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z

Case 4:

AMANAPLANACANALPANAMA

Case 5:

AMANPLANACANALPNAMA

Case 6:

EAEDOHSTSHODEAE
EEDEOHSTSHOEDEE
EEUDOHSTSHODUEE
EEUEOHSTSHOEUEE

Case 7:

LOTTFEININATHOTOODOOTOHTANINIEFTTOL
LOTTFEININATHOTOOFOOTOHTANINIEFTTOL
LOTTFEININATTOTOODOOTOTTANINIEFTTOL
LOTTFEININATTOTOOFOOTOTTANINIEFTTOL
LOTTFEININTHTOTOODOOTOTHTNINIEFTTOL
LOTTFEININTHTOTOOFOOTOTHTNINIEFTTOL
LOTTFEININTHTTORODOROTTHTNINIEFTTOL
LOTTFEININTHTTOROFOROTTHTNINIEFTTOL
LOTTFEININTHTTOROOOROTTHTNINIEFTTOL
LOTTFEININTHTTOTODOTOTTHTNINIEFTTOL
LOTTFEININTHTTOTOFOTOTTHTNINIEFTTOL
LOTTFEININTHTTOTOOOTOTTHTNINIEFTTOL
LOTTFELNINATHOTOODOOTOHTANINLEFTTOL
LOTTFELNINATHOTOOFOOTOHTANINLEFTTOL
LOTTFELNINATTOTOODOOTOTTANINLEFTTOL
LOTTFELNINATTOTOOFOOTOTTANINLEFTTOL
LOTTFELNINTHTOTOODOOTOTHTNINLEFTTOL
LOTTFELNINTHTOTOOFOOTOTHTNINLEFTTOL
LOTTFELNINTHTTORODOROTTHTNINLEFTTOL
LOTTFELNINTHTTOROFOROTTHTNINLEFTTOL
LOTTFELNINTHTTOROOOROTTHTNINLEFTTOL
LOTTFELNINTHTTOTODOTOTTHTNINLEFTTOL
LOTTFELNINTHTTOTOFOTOTTHTNINLEFTTOL
LOTTFELNINTHTTOTOOOTOTTHTNINLEFTTOL

Case 8:

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

Case 9:

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

Case 10:

AAA
BBB

Case 11:

AAABBBAAA
BBBAAABBB

Case 12:

ORATODYETANDTAWATDNATEYDOTARO
URATODYETANDTAWATDNATEYDOTARU
YOATODYETANDTAWATDNATEYDOTAOY
YRATODYETANDTAWATDNATEYDOTARY