because you'd always say light bulb on light bulb off light bulb on light bulb off
because you'd always say light bulb on light bulb off light bulb on light bulb off .
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b e c a u s e WORD_BOUNDARY y o u ' d WORD_BOUNDARY a l w a y s WORD_BOUNDARY s a y WORD_BOUNDARY l i g h t WORD_BOUNDARY b u l b WORD_BOUNDARY o n WORD_BOUNDARY l i g h t WORD_BOUNDARY b u l b WORD_BOUNDARY o f f WORD_BOUNDARY l i g h t WORD_BOUNDARY b u l b WORD_BOUNDARY o n WORD_BOUNDARY l i g h t WORD_BOUNDARY b u l b WORD_BOUNDARY o f f WORD_BOUNDARY