please write a detailed mechanism steps by steps in text (explain what's going on each step).

CN X CN CN n-butanol az or H2N NH, 2 h, reflux s 10% KOH, 1 h, 25 C N | 1 3,4 CICN 10% , 1 h, 25 CY 10% KOH 1 h, 60 C NH2 NH2 CN 10% KOH -CN 1 h, 60C CN S 8 7 5,6