def interpret_command(command):
commands_dict = {
"add": "executing ADD operation",
"+": "executing ADD operation",
"sub": "executing SUBTRACT operation",
"-": "executing SUBTRACT operation"
}
return commands_dict.get(command, "unknown command")
print(interpet_command('add'))
print(interpet_command('+'))
print(interpet_command('sub'))
print(interpet_command('-'))
print(interpet_command('unknown'))
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