a b c d

c

for every $V∈I$ $(V,V)∈R$  (symmetric) for $(V_1,V_2)∈R$ $⇒V_1$ and $V_2$ use their voting right in their general election $⇒(V_2,V_1)∈R$   (Symmetric) $(V_1,V_2)∈R,(V_2,V_3)∈R$ $⇒V_1,V_2,V_3$ all three use their voting right in genral election  $⇒(V_1,V_3)∈R$  (Transitive)