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m{
  ^
...
    | (\d) (\d) (?!\8|\9) (\d) \10
  )
}x;

m{
  ^
...
    | (\d) (\d) (?!\4|\5) (\d) \6
  )
}x;

m{
  ^
  (?= \d* (\d) \d* \1 )
  (?! \d* \1 \d* \1 \d* \1 )
}x;