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See 31-Down
Answer for the clue "See 31-Down ", 3 letters:
arp
Alternative clues for the word arp
Word definitions for arp in dictionaries
Wikipedia
Word definitions in Wikipedia
Arp or ARP may refer to:
Usage examples of arp.
ARP on the very day Neville Chamberlain had mournfully declared war on Germany, and he had dutifully served through both Blitzes on London, twice being buried beneath rubble himself.
When Arp complied with that condition, he was then challenged for his prediction as to how the counts of quasars should vary as a function of their apparent brightness.
If Arp is right, the exotic mechanisms proposed to explain the energy source of distant quasars - supernova chain reactions, supermassive black holes and the like - would prove unnecessary.