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Makefile	Makefile
README.md	README.md
__init__.py	__init__.py
solver.py	solver.py
test_solver.py	test_solver.py

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Subsequences of string

This problem was asked by Microsoft.

Description

Given a string, generate all possible subsequences of the string.

Input: "xyz"
Output: ["", "x", "y", "z", "xy", "xz", "yz", "xyz"]