Note that some of the cheaper cables labelled CW1308 and Cat5 are not "twisted pair". Particularly suspect are flat ones for easy hiding under carpet or going under the corners of doors.
You must get twisted pair, and when using them you must use matched pairs.
For instance, with blue or blue/white you must use white/blue. With orange you must use orange/white. They are coloured this way to identify the wires that are twisted round each other, to help counteract any external electromagnetic interference.
You must not use blue with orange as they are not twisted round each other and the interference effect is magnified not reduced.
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