On Sunday, 2 February 2020 at 08:54:02 UTC, mark wrote:
However, four have not been accepted, apparently for technical reasons. But I don't understand what's wrong or what I need to do to fix them. (I'm not very knowledgeable about github.)

The Travis log suggest that your PRs contain some whitespace errors:

The command "grep -nr --include \*.md '\s$' . ; test $? -eq 1" exited with 1

You could try to execute the ggrep command locally to identify lines containing possible errors.

PS: Feel free to comment on your PR directly s.t. reviewers/bypassers can see that you could use some assistance.

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