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Problem
Given a string S, print all its subsequences (including empty string) using recursion, one per line, in any order.
Input format
Input
input.txt
- A string S (length 1 to 10, lowercase only)
Output format
Output
output.txt
- All subsequences, one per line (empty string included as a blank line)
Example
input
ab
output
(blank line) a b ab
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Sample cases (from the problem)
Sample Case 1
Input
ab
Expected output
(blank line) a b ab
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