The assert is wrong. Dirs should not be tested as equal strings - slash can be omitted.
Swap the first and last columns
Scoring for oriented dominoes
Generate a string like abbcccddddeeeee
Magic is simple (for beginners)
2 b | ~ 2 b
Convert Roman to Arabic Numerals
Back to basics 2 - Function Path
Back to basics 23 - Triangular matrix
Back to basics 9 - Indexed References
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