Nothing
except=function(index,K,nstu){
list_l<-list()
for(i in 1:K){
list_k<-list()
for(j in 1:nstu){
if(index[j,i]==2) list_k<-c(list_k,j)
}
list_l[[i]]<-list_k
}
return(list_l)
}
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