Abstract
It is proved that when (gab, Fab) is an exact electrovacuum solution of the Einstein-Maxwell equations, Ia and ma are orthogonal vector fields, with la null, subject to (Fablb+ma)ma=0 and (lalb, lamb-lbma) a solution of the linearised Einstein-Maxwell equations, then (gab+lalb, Fab+lamb-ulbma) is in fact an excellent solution of the electrovacuum equations.

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