Dear R help

I was hoping you might be able to show me how to write a loop function take
would ccomplish this task.

library(prob)
{
 a <- sample ( 1:20, 100, replace=T)
b<-sample(5:24,100,replace=T)
}
dd <- data.frame(a,b)
dd
# code piece I am looking for
if(subset(dd,c(1,23,ordered=F))is found))( print subset)
else( continue evaluating subsets)
subset(dd,isin(dd,c(1,23), ordered = FALSE))
subset(dd,isin(dd,c(3,23),ordered=F))
subset(dd,isin(dd,c(4,11),ordered=F))
subset(dd,isin(dd,c(7,15),ordered=F))

Thank you
G

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