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String concatenation...Nice ones...Try out this

 
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Output.......
HelloWorld!
HelloWorld
HelloWorld!
HelloWorld!
Hello World!

line 1 line 2 line 3 gives compilation errors...

Here are my doubts....
1.Isn't it wierd that string s1 is fine while line 2 is not compiling??
2.Why is line 3 not compiling when String s1 and String s2 are fine...
3.Why is line 1 not having a line feed in its string?


Please help
 
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