Stripping spaces replaced with dashes

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• Replace with complex logical regular expression

  What is the best way to replace the input string with the following rules:
  
  1. all sequential occurrences of two or several hyphen-symbols (symbol: '-') must be replaced by a hyphen. So, if the input string is "-" then output should be ' - '. If the entry was "a-a-a", then output remains what it is.
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  All rules 1 to 4 must be apllied to the input string.
  Example of replacement logic:
  entry: 'an aa - ss-ee -'
  output: "an aa-ss-ee."
  
  I think that I should use the function "regexp_replace" somehow.
  This solution below does not work because it produces two consecuent dashes "-":

  with t as(
   select 'a   aa ---- ss-ee -' str from dual
  )
  select regexp_replace(str, '--','-') a from t;
  /*a   aa -- ss-ee -*/

  Can you suggest a regular expression for it?

  Maybe something like this:

  SQL> with t as(
    2   select 'a   aa ---- ss-ee -' str from dual
    3  )
    4  select rtrim(rtrim(ltrim(ltrim(
    5         regexp_replace(regexp_replace(str, '(-| )\1+','\1'), '( -|- )', ' ')
    6         , '-') , ' '), '-'), ' ') a from t;
  
  A
  -----------
  a aa  ss-ee
  

  Notice how it ends with 2 spaces in a row in the Middle, because there was a segment with '-' (space followed by '-') which was replaced by a space.

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