Group SAS rows based on conditions

I am new to SAS community and need your help for one of my analysis. I have a table like below:

ID VAR	Group	Breach	Month
1	A	1	202001
2	A	1	202002
3	A	1	202003
4	A	1	202004
5	A	1	202005
6	A	1	202006
7	A	0	202007
8	A	1	202008
9	A	1	202009
10	A	0	202010
11	A	1	202011
12	A	0	202012
13	A	1	202101
14	A	1	202102
15	A	0	202103
16	A	1	202104
17	A	1	202105
18	A	1	202106
19	A	1	202107
20	A	0	202108
21	A	1	202109

I want only to select rows which has 2 consecutive breaches within a group A , only once in a block of consecutive 0’s or 1’s. So basically I want the following table as output:

ID VAR	Group	Breach	Month	Result
1	A	1	202001	No
2	A	1	202002	Yes
3	A	1	202003	No
4	A	1	202004	No
5	A	1	202005	No
6	A	1	202006	No
7	A	0	202007	No
8	A	1	202008	No
9	A	1	202009	Yes
10	A	0	202010	No
11	A	1	202011	No
12	A	0	202012	No
13	A	1	202101	No
14	A	1	202102	Yes
15	A	0	202103	No
16	A	1	202104	No
17	A	1	202105	Yes
18	A	1	202106	No
19	A	1	202107	No
20	A	0	202108	No
21	A	1	202109	No

Thanks in Advance!!

Answer

Welcome 🙂

Try this

data have;
input IDVAR Group $ Breach Month;
datalines;
1 A 1 202001
2 A 1 202002
3 A 1 202003
4 A 1 202004
5 A 1 202005
6 A 1 202006
7 A 0 202007
8 A 1 202008
9 A 1 202009
10 A 0 202010
11 A 1 202011
12 A 0 202012
13 A 1 202101
14 A 1 202102
15 A 0 202103
16 A 1 202104
17 A 1 202105
18 A 1 202106
19 A 1 202107
20 A 0 202108
21 A 1 202109
;

data want;
   set have;
   by Group;
   if Breach = 1 then c + 1;
   if first.Group then c = 1;
   if Breach = 0 then c = 0;
   Result = ifc(c = 2, 'Yes', 'No');
run;