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Build the Sub-sequences

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Build the Subsequences

A subsequence of a string is obtained by deleting zero or more characters from the string while maintaining order. Given a string, generate an array of all subsequences sorted alphabetically ascending, omitting the empty string.

For example, the subsequences of string s = "xyz", not including the empty string, are "x", "xy", "xz", "xyz", "y", "yz", and "z"

Function Description:
Complete the function builds sequences in the editor below.

buildSubsequences has the following parameter(s)
str s: the string to process

str[]: An array of strings comprising all the subsequences of the given string sorted alphabetically, ascending.

1 < length of s <16
s is a string of distinct lowercase English alphabetic letter ascii[a-z]

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Asked In :: SAP Labs HackerRank

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