import math def check(num): for i in range(2,int(math.sqrt(num))+2): if num%i==0: return False return True def find(odd,visited,choose,evens): for i,even in enumerate(evens): if check(odd+even) and not visited[i]: visited[i]=True if choose[i]==0 or find(choose[i],visited,choose,evens): choose[i]=odd...