Как искать сразу несколько подстрок через find в python?

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s = "abcdefgabcdefg"
substr1 = "abc"
substr2 = "def"

start_index = 0
while True:
    index1 = s.find(substr1, start_index)
    index2 = s.find(substr2, start_index)
    
    if index1 == -1 and index2 == -1:
        break
    
    if index1 != -1:
        print(f"Found '{substr1}' at index {index1}")
        start_index = index1 + len(substr1)
        
    if index2 != -1:
        print(f"Found '{substr2}' at index {index2}")
        start_index = index2 + len(substr2)