Step I: (c205–c123 b.c., Greek historian)

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Congratulations on completing the screenshot puzzle of the Entropy Encryption. You have reached the first step of the puzzle. In order to understand the other files of this pastebin, and eventually solve the riddle, you must complete step I. This is the key to Step II.

Hint: To what, yields the greatest results.

Good luck
      ~ English_Teacher
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https://pastebin.com/__________ = Step II
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A 7 Quadrilateral
B b72 Quadrilateral
C XiG Quadrilateral
D G1a Quadrilateral
E p5 Quadrilateral
F Aio Quadrilateral
G duck Quadrilateral
H Cl2 Quadrilateral
I H2O Quadrilateral
J Lis Quadrilateral
K Media Quadrilateral
L Res Quadrilateral
M Victorium Quadrilateral
N Lsat Quadrilateral
O L2 Quadrilateral
P Dc Quadrilateral
Q Eqas Quadrilateral
R yd2 Quadrilateral
S h Quadrilateral
T tesseract Quadrilateral
U u2 Quadrilateral
V ks9 Quadrilateral
W cigx Quadrilateral
X enabled Triangle
Y password Triangle
Z locked Triangle