Duplicating words

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Let's write an echo program. It repeats everything it hears. More precisely, everything in a list of 10 strings. The echo program will actually accomplish this by creating a list of 10 words (we'll enter strings from the keyboard and add them to the list), and the doubleValues ​​method will basically duplicate the words in a specific way. Then we'll display the resulting echo. Piece of cake.
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SUSHANTLevel 8 , Delhi
7 July, 07:54
Can someone tell why is it showing "cannot resolve symbol list"?
RomanLevel 41
8 July, 05:42
Declare a string list variable and immediately initialize it. Have you done it before line 16?