Hi, I runed this invocation, and run very well, just I want to obtain the Tukey's results with literals and not like appear. 
data CEN; 
DO PG=1 to 2;
DO PCH= 1 to 4;
DO BLOQ=1 to 4;
INPUT Y@@;
COMPGPCH= PG*10+PCH;
output;
end;
end;
end;
DATALINES; 
9.93	10.58	9.94	10.18
10.75	9.71	10.53	10.26
.	.	.	.
10.52	10.36	10.35	10.16
12.29	12.06	12.06	11.88
12.00	12.55	12.82	12.52
12.52	11.92	11.98	11.73
12.09	11.88	11.83	11.96
;
proc mixed data=CEN method=reml; 
class pg pch bloq; 
model y= bloq pg bloq*pg pch pg*pch/ ddfm=satterth;
random bloq; 
lsmeans pg pch pg*pch/ adjust=tukey; 
run;