Reflection
The mirror line could be the line y=x, the line y=-x, the x-axis or the y-axis.
Group the points into pairs, where one point is the reflection of the other.
The y-axis is the mirror line for points:
Choose...
A
B
C
D
E
F
H
J
L
N
P
R
S
T
U
V
X
Y
Result:
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