#
#
# a <- 630
# b <- 500
# c <- 480
#
# a_diff <- a - r_update(a, b, 3, 1, NA, 20)
# b_diff <- b - r_update(b, a, 1, 3, NA, 20)
#
# r_update(a, b, 3, 1, FALSE, 20)
#
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