claim: Pattern recognition uses unsupervised learning to discover previously unknown patterns.
evidence: Overhead wire markers are safety instruments applied to the overhead power lines marking transmission lines and ropeways along the flight path during the day .. Markers are often installed on overhead lines near airfields , or at river crossings where there is a possibility of float-equipped aircraft using the river .. Some markers contain conductor marking lights or strobe lights to improve visibility at night or in fog .. conductor marking lights. conductor marking lights