4/1	4/8	4/15	4/22
S1	S2	P	S1
S1	S2	B	S1
S1	P	S2	S1
S1	B	S2	S1
S1	P	S2	S1

5/6	5/13	5/20	5/27
S1	S1	B	S3
S1	S1	P	S3
S1	S1	B	S3
S1	S1	P	S3
S1	S1	B	S3