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2: Ohio
4: Potomac
6: Rio Grande
8: Susquehanna
10: Snake

3: bitter
6: Birmingham
9: Biafra
12: bituminous
15: Biddle

2: Zachary
4: Zelda
6: Zane
8: Zaire, Zion
10: Zebulon

3: J. K. Rowling
6: Sir Arthur Conan Doyle
9: George Eliot
12: Forsyte Saga
15: Anne

2: Munich
4: São Paulo
6: Darwin
8: Olympia
10: Sapporo

3: Boston
6: CLAM
9: Naomi
12: CLAM
15: ruthenium

2: temperature
4: ibuprofen
6: strep throat
8: uvula
10: Eustachian tube

3: Candle in the Wind
6: Howe
9: CLAM
12: Alaric
15: In Memoriam

2: CLAM
4: Suddenly Susan
6: coddled
8: eddas
10: CLAM

3: Grant Wood
6: John Singer Sargent
9: Andy Warhol
12: Lange
15: Maya Lin

2:New York
4: skee ball
6: Waterworld
8: Donkey Kong
10: y

3: George Wallace
6: Jerry Brown
9: Illinois
12: Kasich
15: New Jersey

2: stick shift
4: Coca-Cola Classic
6: analog clock
8: disposable batteries
10: CLAM

3: It's a Wonderful Life of Pi
6: A Clockwork Orange is the New Black
9: Sister Carrie Diaries
12: CLAM
15: CLAM

2: surge
4: ruse
6: rebus
8: berg
10: CLAM

3: AT&T, Time Warner
6: DMV
9: IKEA
12: Keurig
15: cymbals

2: caste system
4: salt
6: Kolkata/Calcutta
8: Mughal
10: Tagore

3: piper
6: pirates
9: pungent
12: poinsettia
15: CLAM

2: Saturday
4: Autotune
6: Glee
8: Baby
10: Kohl's

3: Iron
6: EPA
9: Argon
12: stratosphere
15: Panthalasan Ocean

2: Comet
4: javelin
6: Aspen
8: Skylark
10: Cimarron

3: Animal House
6: Jack Nicholson
9: clam
12: Paxton
15: clam

2: trimester
4: As You Like It
6: bargaining
8: Masters and Johnson
10: CLAM

3: owl and the pussycat
6: Pratchett
9: Warriors
12: CLAM
15: CLAM

2: clam
4: Statue of Liberty
6: Chicago
8: philately
10: inverted Jenny

3: charging interest
6: Abraham
9: Friday
12: Eid
15: this depends on the movement, but you're probably looking for Ali

2: Fred Rogers
4: George Foreman
6: Omarosa
8: CLAM
10: Liddell

3: Neon
6: maim
9: grog
12: eave
15: fief

2: Disneyland
4: maple
6: oak
8: Hardy
10: CLAM

3: Dawson
6: Addams Family
9: quahog
12: Jay
15: CLAM

2: Lords a leaping
4: Fermium
6: spelling bee
8: myriad
10: Wilson

3: Mexico City
6: Wellington
9: Baku
12: Kinshasa, Brazzaville
15: Palau

2: Joe Namath
4: Joe Montana
6: Joe Flacco
8: Joe Theismann
10: St. Louis Rams

3: Waterloo
6: bugaboo
9: wahoo
12: CLAM
15: Espoo

2: lamp
4: CLAM
6: Baal
8: Amaterasu
10: Mjollnir

3: spaghetti
6: linguini
9: farfalle
12: tortellini
15: ziti

2: electric shock
4: fight or flight
6: autism spectrum
8: Stanford
10: polygraph

3: latrine
6: minaret
9: inertia
12: keratin
15: CLAM