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In relation to the newly observed bottom-strange X^{+,-}(5568) mesons, werevisit our tetra-quark interpretation of X(3872) and Z_c(3900). It isdiscussed that our assignment of X^{+,-}(5568) to charged components ofiso-triplet bottom partners of D_{s0}^+(2317) is compatible with the revisedversion of our tetra-quark interpretation of X(3872) and Z_c(3900).

Tetra-Quark Interpretation of X(3872) and Z_c(3900) Revisited