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if option==0: if len(L)==0: L.append(x) else: L.insert(0,x) elif option==1: L.append(x) elif option==2: try: pos=L.index(a) L.insert(pos+1,x) except: L.insert(0,x) elif option==3: try: L.remove(x) except: pass elif option==4: i=0 while i < len(L): if L[i] == x: L.pop(i) else: i += 1 elif option==5: if len(L) > 0: L.pop(0) elif option==6: for ele in L: print(ele, end=" ") return