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expand.grid
data.table
expand.grid.DT(seq1, seq2, seq3 = NA, seq4 = NA, col.names = NA)
expand.grid.DT(1:10, 100:110) expand.grid.DT(1:10, 100:110, col.names=c("A", "B")) expand.grid.DT(1:10, 100:110, 11:13, 1:2)
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