cat("Exactly once:")
for(i in c(400,600))
for(j in c(40,60))
for(k in c(4,6))
cat(1000+i+j+k, " ")
cat("\n")
cat("At least once:")
for(i in c(400,600,700,800))
for(j in c(40,60,70,80))
for(k in c(4,6,7,8))
cat(1000+i+j+k, " ")
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