Can we first arrive at the correct answer to the original scenario, and let the aircraft carrier scenario be moved to its own thread(possibly in the ALR so that zuzuman03 will be happy)?
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4x4 in uppercase is $X$!!!
1997 R50: VG33E/RE4R01A/TX10/3.7/R200A/ARB/4.636/H233B/ARB/4.636/321150R15