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Fox ruled Thursday among young adults for most of the fall, but CBS captured its second straight demo victory on the night this week, boosted in part by ”Person of Interest,” which drew its largest overall audience since its premiere.

CBS won the night in 18-49, 25-54 and total viewers, with Fox second in these categories, according to preliminary national estimates from Nielsen.

For CBS, a repeat of ”The Big Bang Theory” tied as the night’s No. 1 show in demos (2.8/9 in 18-49, 10.1 million viewers overall), beating out Fox’s ”X Factor” head-to-head, and ”Rules of Engagement” followed with a solid second-place showing for its original episode (2.7/8 in 18-49, 9.7 million viewers overall), down 10% from last week when it aired behind a firstrun ”Big Bang.” At 9, ”Person of Interest” took advantage of atypically soft competition to win its hour (2.8/8 in 18-49, 12.8 million viewers overall) , on par with last week in the demo (tying as the night’s top show) and up slightly in total viewers for its biggest overall audience since its September premiere. And ”The Mentalist” kept CBS on top at 10 (2.7/7 in 18-49, 13.0 million viewers overall).

Fox’s ”The X Factor” results show (2.8/8 in 18-49, 9.7 million viewers overall) was in line with last week and continues to show no real late-season momentum in advance of its finale next Thursday; it tied as the night’s No. 1 show in 18-49, pulling ahead in its second half-hour (3.1/9). From 9 to 10, the net repeated the episode of ”Bones” (1.5/4 in 18-49, 5.4 million viewers overall) that served as the back-door pilot for spinoff ”The Finder,” which bows in the timeslot next month.

At ABC, the second airing this month of ”A Charlie Brown Christmas” opened the night (1.8/5 in 18-49, 6.4 million viewers overall), and the net then aired the two-hour special ”The Year With Katie Couric” (1.5/4 in 18-49, 5.5 million viewers overall), which delivered the lowest score in the 9-11 p.m. timeslot this season for the net.

NBC had a quiet night, with repeats of comedies ”Community” (0.8/2 in 18-49, 2.3 million viewers overall), ”Parks and Recreation” (0.7/2 in 18-49, 1.8 million viewers overall), ”The Office” (1.1/3 in 18-49, 2.4 million viewers overall) and ”Whitney” (0.8/2 in 18-49, 2.1 million viewers overall), followed by one of the final original episodes of rookie drama ”Prime Suspect” (0.8/2 in 18-49, 3.6 million viewers overall).

CW aired repeats of ”The Vampire Diaries” and ”The Secret Circle,” averaging about 950,000 viewers.

Preliminary 18-49 averages for the night: CBS, 2.8/8; Fox, 2.2/6; ABC, 1.6/4; Univision, 1.4/4; NBC, 0.8/2; CW, 0.3/1.

In total viewers: CBS, 11.9 million; Fox, 7.5 million; ABC, 5.8 million; Univision, 3.5 million; NBC, 2.6 million; CW, 0.9 million.