What will be the output of the following code snippet?

f = open("data.txt", "w+")

txt = "This is 1st line\n"

f.writelines( txt )

seq = " This is 2nd line\nThis is 3rd line"

f.seek(0, 2)

f.writelines( seq )

myList = []

for line in f:

    myList.append(line)

print(myList)

f.close()