4aR: 4-bet after RaiseOf times they raised pre-flop and were re-raised, 4aR is the percent of the time that they raised again (4-bet) in response. per_hand: true
raise_count: since start_of_round count (action == Raise)
preflop_raiser: action == Raise and round == P and raise_count == 1
opportunity: preflop_raiser and raise_count == 2
instance: action == Raise
split position
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