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Insert the separator that we consider to later perform the reverse operation.
vector_to_string(vector)
A string.
A vector of strings.
Other support functions: create_question_csv(), create_question_data_frame(), create_question_excel(), read_question_csv(), read_question_excel()
create_question_csv()
create_question_data_frame()
create_question_excel()
read_question_csv()
read_question_excel()
s <- vector_to_string(c('Addition', '+'))
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