Varied Line Color, How to do it?!

[hellohere]

I need generate 3-by-2 plots, which the code below does. BUT also need let the lines are with varied colors.

There are GROUPLC= and styleattrs datacontrastcolors=(red green black orange blue cyan);  BUT only for multiple lines within a single plot.

How to get 3-by-2 plots with controlled/varied colors?

Any other PROC is fine. 

Thanks,  

data _test;
do grp=1 to 6;
	do ind=1 to 100;
		yvalue=sin(ind/10)+grp;
		gx=grp;
		output;
	end;
end;
run;quit;

	ods layout gridded columns=3 rows=2 advance=bygroup;
	proc sgplot data=_test noautolegend uniform=xscale; 
	by grp;
	series x=ind y=yvalue / group=grp lineattrs=( thickness=2 pattern=solid) grouplc=grp ;     
	refline  30/axis=x lineattrs=(color=red thickness=2 pattern=solid); 
	run;
	ods layout end;

[Quentin]

I think this could be done by using a discrete attribute map, to map each group value to a color.

data _test;
do grp=1 to 6;
	do ind=1 to 100;
		yvalue=sin(ind/10)+grp;
		gx=grp;
		output;
	end;
end;
run;quit;

data mymap ;
  input value  linecolor $10. ;
  retain id "grp" ;
  cards ;
1 Red
2 Blue
3 Yellow
4 Green
5 Purple
6 Black
;

ods layout gridded columns=3 rows=2 advance=bygroup;
proc sgplot data=_test noautolegend uniform=xscale dattrmap=mymap; 
  by grp;
  series x=ind y=yvalue / group=grp lineattrs=( thickness=2 pattern=solid) attrid=grp;     
  refline  30/axis=x lineattrs=(color=red thickness=2 pattern=solid); 
run;
ods layout end;