Consider a CDMA system in which users A and B have the codes $(1-1-1-1-1-1-1-1)$ and $(-1-1-1-1-1-1-1-1),$ respectively. If A wants to transmits a data $($bit $0).$ What is transmitted from A and how does the receiver recognizes that a data bit $1$ is received from A and not from B$.$