(IUCr) Synthesis and crystal structure of <span class="it"><i>catena</i></span>-poly[[bis(pyridine-4-carbonitrile-<span class="symbol">κ</span><span class="it"><i>N</i></span><span class="sup"><sup>1</sup></span>)cobalt(II)]-di-<span class="symbol">μ</span>-thiocyanato-<span class="symbol">κ</span><span class="sup"><sup>2</sup></span><span class="it"><i>N</i></span>:<span class="it"><i>S</i></span>;<span class="symbol">κ</span><span class="sup"><sup>2</sup></span><span class="it"><i>S</i></span>:<span class="it"><i>N</i></span>]