How to simplify Calc formula?

[TH]

In Excel, I have one formula:

=IF(AND(F287=G287,G287=H287), "-Ф-","")&
IF(AND(F287<>G287,F287<>H287,G287<>H287,
COUNTIF(F286:AP286,F287)>0,COUNTIF(F286:AP286,G287)>0,
COUNTIF(F286:AP286,H287)>0),A287-A286&"-ONE-","")&
IF(AND(F287<>G287,F287<>H287,G287<>H287,
OR(AND(COUNTIF(F286:AP286,F287)>0,COUNTIF(F286:AP286,G287)>0,
COUNTIF(F286:AP286,H287)=0),
AND(COUNTIF(F286:AP286,F287)>0,COUNTIF(F286:AP286,G287)=0,
COUNTIF(F286:AP286,H287)>0),AND(COUNTIF(F286:AP286,F287)=0,
COUNTIF(F286:AP286,G287)>0,COUNTIF(F286:AP286,H287)>0))),A287-A286&"---b","")&
IF(OR(AND(F287=G287,F287<>H287,COUNTIF(F286:AP286,F287)>0,
COUNTIF(F286:AP286,H287)>0),AND(F287=H287,F287<>G287,
COUNTIF(H286:AP286,F287)>0,COUNTIF(F286:AP286,G287)>0),
AND(F287<>G287,G287=H287,COUNTIF(F286:AP286,F287)>0,
COUNTIF(F286:AP286,G287)>0)),A287-A286&"---m-","-")

I want to shortcut that formula, or change with a shorter. Help me, please! Very thanks!

(Slightly edited for readability by @Lupp.)

[mikekaganski]

My first reaction was to downvote the question, because it shows lack of respect to those you are addressing your question to. Do you expect people to understand the logic of a complex formula without any plain-text explanation of what does it do, and what data it operates on, etc.? It looks plain rude.

But possibly that is just an oversight, and you would want to clarify your question, and add a sample file with data and use-case for the formula, and explain it in plain words.

[Lupp]

See also: Why do I often get an error (508, 504, 502 e.g.) if I paste a Calc formula from some post into my sheet?

[mariosv]

Seems there are three different COUNTIF repeated several times, putting it on other column/row and referencing, can simplified a bit, also using named formulas for them.