```{r test_id, message=FALSE, results="show", echo=TRUE, warning=FALSE}
require(data.table) # print?
DT = data.table(x=1:3, y=4:6) # no
DT # yes
DT[, z := 7:9] # no
print(DT[, z := 10:12]) # yes
if (1 < 2) DT[, a := 1L] # no
DT # yes
```
Some text.
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