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operator (... ) This is the optional item emitted by the Mono These dotted lines and this boxindicate that a transformationis being applied to the MonoThe text inside the box showsthe nature of the transformation This vertical line indicates thatthe Mono has completed successfully This is the timeline of the MonoTime flows from left to right This Mono is the resultof the transformation If for some reason the Mono terminatesabnormally, with an error, the verticalline is replaced by an X