Please do all the questions!

Q4 Streams 14 Points All answers must start with a way to source a stream, followed by a single sequence of ONLY stream operations including collect and any operation on For each answer, the result MUST be assigned to a named and typed variable: e.g. Integer res = sequence of stream operations Here res (name) is the result variable of Integer (type) You don't need to write import statements for any of the classes and interfaces you use. Q4.1 9 Points In a document named doc.txt, count unique words (case Insensitive) by length, i.e. how many unique words of what length. (For instance, 3 words of length 4,5 words of length 3, etc.) Assume that a word is a sequence of non-space characters, and each line of the document has one or more words. Enter your answer here Consider an n2 array, in which each of the 2 columns represents a vector. Write code to get the dot product of the column vectors, i.e. sum of products of corresponding items. For example, [1,2,3].[2,2,4]=12+22+34=18