str1 = "This is a demo string"
str2 = "This is another  demo string"
strz = ("This is a line\n" +
       str1 + "\n" +
       "This is line 2\n" +
       str2 + "\n" +
       "This is line 3\n")
print(strz)

This is a line
This is a demo string
This is line 2
This is another  demo string
This is line 3

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