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alkyl phosphoric acids bismuth bisalicylate dahabiyeh distress call (sos or mayday) drilling rod centralizer gironit (chrysargyrit) hailey and hailey disease halfwave plate humic glei soil land lines peg warmer perennially frozen ground plasmalemmata stack-pipe stickball game strip clearcutting Taurion USB flash drive venae supratrochleares weinert