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was found to be very stable, as is generally also the case for extended systems ( N → ∞ ) in which the model state is known to be a “good starting point”. 

These results prove the principle that the CCM may be used to study finite-sized lattices. 

## IV. CONCLUSIONS 

Again, we remark that recent developments of high-order CCM have been to extend existing formalism and codes to s ≥ 1 2 for both the ground and excited states [52], and independently to “generalised” expectation values for a wide range of one- and two-body spin operators [53]. We note that the CCM is that the Goldstone linked-cluster theorem is obeyed at all levels of approximation and so it provides results in the infinite lattice limit N → ∞ from the outset. In this article, we have shown the exact ground state for the 

