TO, PD, FP, FCA, M, ?

They can be anything from sports to instruments but it is difficult to consider the hidden sequence.

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    $\begingroup$ This is from a running contest: psiq.org/tests/timroberts_20200131.pdf $\endgroup$ – Jaap Scherphuis Jan 5 at 11:52
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    $\begingroup$ I'm voting to close this question as off-topic because it's from an ongoing contest as @Jaap notes above. $\endgroup$ – Rand al'Thor Jan 5 at 13:49
  • $\begingroup$ I've locked the question. It can be unlocked when the contest is over. $\endgroup$ – Gareth McCaughan Jan 5 at 14:30