Consider the following three relations

R

Sno	Pno
S1	P1
S1	P2
S2	P1

Q

Pno	Jno
P1	J2
P2	J1
P1	J1

S

Jno	Sno
J2	S1
J1	S1
J1	S2

Query : ((R ⋈ Q)⋈S)

Find out the no. of rows results come as output for the above query.