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Double particles certainly occur in Japanese, but do triple particles ever occur? And if so, what is their pitch pattern?
Off the top of my head, I can think of 〜からには
かれがここへ着くまでには仕事を終えているでしょう → I will finish my job by the time he gets here
*Example sentence taken from スーパー大辞林 in macOS Sierra 10.12
Required, but never shown