関連ワード:  what does r mean in blackjack    what does r mean in blackjack strategy    what does r mean in blackjack book    what does r mean in blackjack basic strategy    what does r mean in blackjack chart    what does r mean blackjack table    what does r mean in blackjack card    what does r mean in blackjack strategy chart    what does r mean in blackjack reddit    what does r/n mean in blackjack