The hardest thing is to use a hexadecimal input. Most on-line sites deal only with text. Exception: https://emn178.github.io/online-tools/sha256.html
Project Euler: Problem 8, Find largest product in a large string of numbers
Poker Series 04: isFlush
Angle between Two Vectors
QWERTY Shift Encoder
first step for Huffman Coding (easy)
Calculate the Surface Area of an Ellipsoid
Area of Triangle with Oblique Coordinates
Binary Array to Hex Representation
Radioisotope Thermoelectric Generator (RTG)
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