You are given the following data: Time Group 1 Group 2 Group 3 t;- di C;- di (:1- dg; Ci 1 1 2 0 1 0 O 2 1 2 1 1 1 1 3 1 0 0 2 3 O 4 0 0 1 0 2 1 where (11- and c,- are the numbers of death and rightcensored observations at time 73?; from respective groups. A Cox regression model is used for modelling the data. Let 6'61 and 6'82 be the hazard ratio from groups 2 and 3 compared with group 1. Write down the score functions of 181 and g based on this sample using the Breslow's approximation for handling tie observations