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                <term xml:lang="en">Partial 2-tree</term>
                <term xml:lang="en">K_4 minor-free graph</term>
                <term xml:lang="en">Series-parallel graph</term>
                <term xml:lang="en">Girth</term>
                <term xml:lang="en">Oriented chromatic number</term>
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              <p>A homomorphism from an oriented graph G to an oriented graph H is an arc-preserving mapping f from V(G) to V(H), that is f(x)f(y) is an arc in H whenever xy is an arc in G. The oriented chromatic number of G is the minimum order of an oriented graph H such that G has a homomorphism to H. In this paper, we determine the oriented chromatic number of the class of partial 2-trees for every girth g&gt;= 3.</p>
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