please answer this question thank you. using single link

Consider clustering data about four items a, b, c and d. The table below shows the distance between the individual items. The first step of agglomerative hierarchical clustering algorithm results in the clusters {a,b},{c},{d}. Show the calculation and resulting clustering, for the next step of the algorithm; you may choose any reasonable distance metric between clusters (but state which metric you use). If you need to break ties, state how you did so