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Riphean time
abbr.	R (MichaelBurov)   ؛Riphean (MichaelBurov)   ؛Riphaean (MichaelBurov)   ؛the Riphean (MichaelBurov)   ؛the Riphaean (MichaelBurov)   ؛Riphean era (MichaelBurov)   ؛Riphaean era (MichaelBurov)   ؛Riphean erathem (MichaelBurov)   ؛Riphaean erathem (MichaelBurov)   ؛Riphean epoch (MichaelBurov)   ؛Riphaean epoch (MichaelBurov)   ؛Riphean age (MichaelBurov)   ؛Riphaean age (MichaelBurov)   ؛Riphaean time (MichaelBurov)