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What is the value of the expression when a = 27 and b = -6 ?

A PHP Error was encountered

Severity: Warning

Message: touch(): Unable to create file sessions/ci_session6dbe0e8b82804bd9dd32606bad1cbeb606186cad because No such file or directory

Filename: drivers/Session_files_driver.php

Line Number: 252

Backtrace:

A PHP Error was encountered

Severity: Warning

Message: session_write_close(): Failed to write session data using user defined save handler. (session.save_path: sessions)

Filename: Unknown

Line Number: 0

Backtrace: