Challenge 3: print vs say — Possible Solution
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Version 1 — using only print:

    #!/usr/bin/env perl
    use strict;
    use warnings;

    print "Line one\n";
    print "Line two\n";
    print "Line three\n";

Version 2 — using say:

    #!/usr/bin/env perl
    use strict;
    use warnings;
    use feature 'say';

    say "Line one";
    say "Line two";
    say "Line three";

Both produce identical output:
Line one
Line two
Line three

WHY THIS WORKS AS AN ANSWER
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Version 1 reuses the chapter's own explicit point that print requires
manually adding \n at the end of each string — each of the three
print calls includes its own \n, since print never adds one on its
own, and skipping it (as the chapter's earlier "Hello, World!" example
without \n would demonstrate) would run every line together with no
line breaks at all.

Version 2 reuses use feature 'say'; (the required enabling line from
Challenge 1) and then omits \n entirely from each of the three say
calls, since say's whole purpose — per the chapter's own description
— is adding that trailing newline automatically.

Both versions produce the exact same visible output specifically
because \n and say's automatic newline behavior are doing the same
job by two different means — the challenge's own point is to make
that equivalence concrete rather than just stated, by actually writing
both forms side by side and confirming they match.