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                <term xml:lang="en">Triangular lattice</term>
                <term xml:lang="en">Choosability</term>
                <term xml:lang="en">Coloring</term>
                <term xml:lang="en">Free-choosability</term>
                <term xml:lang="en">Core</term>
                <term xml:lang="en">Triangular lattice.</term>
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