#! /usr/bin/env python

def main():    # Don't leave the code in the global namespace, it runs slower
    import sys

    tokenizedInput = map(int, sys.stdin.read().split())
    testcases = tokenizedInput[0]

    alphabet = "bcdefghijklmnopqrstuvwxyzbcdefghijklmnopqrstuvwxyzbcdefghijklmnopqrstuvwxyzbcdefghijklmnopqrstuvwxyzb"

    for count in xrange(0,testcases):
        K = tokenizedInput[count+1]
        for x in reversed(xrange(0, K)):
            sys.stdout.write(alphabet[x])
            if (alphabet[x] == 'b'):
                sys.stdout.write('a')
        sys.stdout.write('\n')

main()

6a609b89514f31d1b5829aa13ce84df25b97ef65
<mask token>

def main():
    import sys
    tokenizedInput = map(int, sys.stdin.read().split())
    testcases = tokenizedInput[0]
    alphabet = (
        'bcdefghijklmnopqrstuvwxyzbcdefghijklmnopqrstuvwxyzbcdefghijklmnopqrstuvwxyzbcdefghijklmnopqrstuvwxyzb'
        )
    for count in xrange(0, testcases):
        K = tokenizedInput[count + 1]
        for x in reversed(xrange(0, K)):
            sys.stdout.write(alphabet[x])
            if alphabet[x] == 'b':
                sys.stdout.write('a')
        sys.stdout.write('\n')


<mask token>

def main():
    import sys
    tokenizedInput = map(int, sys.stdin.read().split())
    testcases = tokenizedInput[0]
    alphabet = (
        'bcdefghijklmnopqrstuvwxyzbcdefghijklmnopqrstuvwxyzbcdefghijklmnopqrstuvwxyzbcdefghijklmnopqrstuvwxyzb'
        )
    for count in xrange(0, testcases):
        K = tokenizedInput[count + 1]
        for x in reversed(xrange(0, K)):
            sys.stdout.write(alphabet[x])
            if alphabet[x] == 'b':
                sys.stdout.write('a')
        sys.stdout.write('\n')


main()

#! /usr/bin/env python

def main():    # Don't leave the code in the global namespace, it runs slower
    import sys

    tokenizedInput = map(int, sys.stdin.read().split())
    testcases = tokenizedInput[0]

    alphabet = "bcdefghijklmnopqrstuvwxyzbcdefghijklmnopqrstuvwxyzbcdefghijklmnopqrstuvwxyzbcdefghijklmnopqrstuvwxyzb"

    for count in xrange(0,testcases):
        K = tokenizedInput[count+1]
        for x in reversed(xrange(0, K)):
            sys.stdout.write(alphabet[x])
            if (alphabet[x] == 'b'):
                sys.stdout.write('a')
        sys.stdout.write('\n')

main()
