SAS code to identify different values in multiple rows according to one subject

the following data structure is given:

I want to know: How can i create a new variable that includes if someone actually has the combination of E10 AND E11 (0,1) as follows:

Thanks in advance,

PP

Assumption is that the data is already sorted by id.

data want;
	do until (last.id);
		set have;
		by id;
		if value = 'E10' then E10 = 1;
		if value = 'E11' then E11 = 1;
	end;

	do until (last.id);
		set have;
		by id;
		if E10 = 1 and E11 = 1 then combination = 1;
		else combination = 0;
		output;
	end;

	drop E:;
run;

 id   case  value  dummy  combination
123   4736   E10     1        1
123   1254   N65     0        1
123   997    E11     1        1
123   7655    x      0        1
987   1234    x      0        0
987   6376   E10     1        0
987   980    E18     0        0