A3. Let $A=\diamond-\odot+\boldsymbol{\phi}, B=-\boldsymbol{\phi}-\odot+\diamond$ and $C=\ominus-\diamond+\boldsymbol{\phi}$. Then $A-B-C$ is equal to:
(A) 0
(B) $3 \diamond-3 \odot-$
(C) $\odot$
(D) $\diamond$
(E) $\diamond-\odot+$
A3. We calculate: $A-B-C=\diamond-\odot+\boldsymbol{\phi}-(-\boldsymbol{\phi}-\odot+\diamond)-(\odot-\diamond+\boldsymbol{\phi})=\diamond-\odot+\boldsymbol{\phi}$