Code:
alias badnick {
  return nick1 nick2 nick3
}
on *:NICK: {
  if $nick(#mychannel,$newnick,a,o) {
    var %i = 1
    while $gettok($badnick,%i,32) {
      if $+(*,$gettok($badnick,%i,32),*) iswm $newnick {
          hinc -m badnick $newnick
          var %badnick = $gettok($badnick,%i,32)
          if ($hget(badnick,$newnick) == 1) do something here
          elseif ($hget(badnick,$newnick) == 2) do another here
      }
      inc %i
    }
  }
}