#Qns 1
x=[10,20]
y=[30,40]
#Qns 2
combi = []
combi.append(x)
combi.append(y)
#Qns 3
#method 1
del combi[0]
del combi[0]

#method 2
#del combi[:2]

#Qns 4
extension =[50,30,79,25,35,22]
combi.extend(extension)
#Qns 5
del combi[1]

#Qns 6
combi.sort(reverse=True)
print (combi