Solution by Ruben Westerberg

ch-1.pl and ch-1.raku
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Rotate matrix
Run program to demonstrate rotating matrix by 90, 180 and 270 deg


ch-2.pl and ch-2.raku
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Vowels
Run the program with a single command line argument  between 1 and 5 (default is 2). Program generates list of strings of this length from vowels and which abide by the specified rules.