I’m very comfortable in C and C++ and pretty comfortable in Java and PHP, but Python is just fun and it’s enjoyable and it makes sense.
[Book] Software Engineering at Google, T. Winters, T. Manshreck, H. Wright
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Equal (5): Everything in this space must be equal to 5. The answer is 5-5, placed vertically; 5-1, placed horizontally.
Number (9): Everything in this space must add up to 9. The answer is 6-5, placed horizontally; 1-4, placed vertically.