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Give an example for which vecA.vecB=vecC...

Give an example for which `vecA.vecB=vecC.vecB` but `vecA!=vecC`.

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For example, as shown in the figure
`vecA` is perpendicular to `vecB`
along west `vecB` is perpendicular to `vecC`
`vecA` along south `vecC` along north, `vecA`.`vecB`=0
`vecA`.`vecB`=`vecB`.`vecC`
`vecB`.`vecC`=0
but `vecA!`=`vecC`
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