The two lines are mainly used for redundant and therefore fault-tolerant message transmission, but they can also transmit different messages.

Mistrust me not thus causeles, for routhe; Sin to be trewe I have yow plight my trouthe.

They had called their children Ann, Mary, and John as a reaction against their own fancy tricksy names. Both mothers thought these names sadly unimaginative and each blamed the child of the other for the lack of vision and style.

Using some tweezers, he worked the bee sting out of his hand.