Question: DATA Q; INPUT Trt $; DO Replication = 1 TO 4; INPUT Y @@; OUTPUT; END; CARDS; Trt1 23 27 19 21 Trt2 18 17

DATA Q; INPUT Trt $; DO Replication = 1 TO 4; INPUT Y @@; OUTPUT; END; CARDS; Trt1 23 27 19 21 Trt2 18 17 20 15 Trt3 29 31 32 34

proc print; RUN;

If I run this in SAS, I obtain the following output:

Obs Trt Replication Y
1 Trt1 1 .
2 Trt1 2 18
3 Trt1 3 17
4 Trt1 4 20
5 15 1 .
6 15 2 29
7 15 3 31
8 15 4 32

Could you give me a break down of how this output is obtained?

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