Here is yet one more simplification.  Note that seq9 in this one
is not the same as seq9 in the last one.  This one looks much
more symmetric in the arguments and is shorter:


seq9 <- function(i) seq(0, len = 9, by = i)
jj <- function(i,j) outer( seq9(i), seq9(j), "+" ) %% 9 %/% 3 + 1

jj1. <- jj(3,1)
jj2. <- jj(3,5)
jj3. <- jj(4,1)

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