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Consider the following lines C(1) and C(...

Consider the following lines `C_(1)` and `C_(2)` ,
`C_(1):(y)/(3)=(x)/(3)+1`
`C_(2):(y)/(3)=-(x)/(3)+1`
Let `C_(3)` be the straight line which is perpendicular to `C_(2)` and whose `y` -intercept is `4`.
Define `S_(1)` to be the set of points of intersection of `C_(1)` and `C_(2)` `S_(2)` to be the set of points of intersection of `C_(1)`and `C_(3)` `S_(3)` to be the set of all the points of intersection of `C_(1)` and `C_(2)`` or ``C_(1)` and `C_(3)`
What is the cardinality of `S_(1)uu S_(3)`?

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