Nothing
printSudoku <- function(z) {
z[z==0] <- " "
for (r in 0:9) {
if (r > 0) cat(" |", z[r,1:3], "|", z[r,4:6], "|", z[r,7:9], "|\n")
if (r %% 3 == 0) cat(" +-------+-------+-------+\n")
}
}
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