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#!/usr/bin/env python3
import sys
if __name__ == '__main__':
if len(sys.argv) != 2:
print(sys.argv[0], 'input_file')
sys.exit(1)
with open(sys.argv[1]) as f:
ifile = f.read()
if ifile != 'This is a text only input file.\n':
print('Malformed input')
sys.exit(1)
print('This is a binary output file.')
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