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args <- commandArgs(TRUE)
options(digits=22)

library("Matrix")

X <- as.matrix(readMM(paste(args[1], "X.mtx", sep="")))

Y = as.matrix(aggregate(X[,1] ~ X[,2], data=X, length)[,1]);
Z = matrix(7, nrow(Y)+ncol(Y), nrow(Y)+ncol(Y)+1);

writeMM(as(Z, "CsparseMatrix"), paste(args[2], "Z", sep=""));