I'm still working on the domino puzzle.  Its just a snazzy version of Post's Correspondence Problem (PCP).  You can read all about it on Ling Zhao's very informative website.

I'll be posting a tutorial on how to solve PCP puzzles soon.  Until then you'll just have to be in the know.

Puzzle:	Aarmory of Aardvarks Abandonment of Orphans Abominable Sight of Monks Absence of Waiters Accompaniment of Condiments Addition of Mathematicians Agenda of Tasks Amble of Walkers Ambush of Widows Annoyance of Mobile Phones Anvil of Blacksmiths Archive of Programmers Armada of Ships Army of Caterpillars Army of Frogs Array of Luminaries Assemblage of Jigsaw Puzzlers Assembly of Toys Asylum of Managers Atlas of Maps Attitude of Teenagers Audit of Accountants Audit of Bookkeepers Aurora of Polar Bears Autumn of Leaves Babel of Words Balance of Accountants Bale of Turtles Ballet of Swans Band of Gorillas Band of Jays Band of Men Bank of Circuits Bank of Monitors Barren of Mules Battery of Tests Beautification of Spatulas Bed of Clams Bed of Oysters Bed of Snakes Belt of Asteroids Bend of Willows Bestiary of Mythological Creatures Bevy of Beauties Bevy of Business Angels Bevy of Dowagers Bevy of Quail Bevy of Swans Bevy of Tanked Sorority Girls Bill of Particulars Billing of Consultants Billow of Smokers Blaze of Pyromaniacs Blessing of Unicorns Bloat of Hippopotami Blur of Bicyclists Blush of Embarrassments Boast of Soldiers Body of Pathologists Bond of British Secret Agents Bong suckling of White House Staffers Boo of Surprises Book of Mormons Bottle of Source Code Bouquet of Flowers Bouquet of Pheasants Bout of Estimations Brace of Grouse Brace of Orthodontists Bridge of Admirals Brigade of Soldiers Broadside of Artillery Shells Brood of Hens Buffoonery of Orangutans Building of Rooks Bunch of Drongoes Bunch of Grapes Bunch of Janes Burden of Yolks Bury of Conies Business of Ferrets Business of Flies Cackle of Hyenas Calendar of Saints Candle of Tapirs Cast of Actors Cast of Falcons Cast of Hawks Cavalcade of Horsemen Cavvy of Extra Cowboy Mounts Cete of Badgers Chain of Islands Charlotte of Web Pages Charm of Finches Chattering of Choughs Chorus of Angels Circle of Babbitts Circus of Fighter Clank of Tanks Class of Students Clatter of Tanks Click of Computer Mice Clipping of Geldings Cloud of Bats Cloud of Gnats Cloud of Grasshoppers Cloud of Plankton Clowder of Cats Clump of Freshman Cluster of Alpha Computers Cluster of Grasshoppers Clutch of Auto Mechanics Clutch of Chicks Clutch of Eggs Clutch of Kleptomaniacs Clutch of Leering Women Clutch of Wrestlers Clutter of Cats Clutter of Starlings Collective of Nouns College of Electors Colony of Ants Colony of Beavers Colony of Gulls Colony of Microbiologists Colony of Penguins Colony of Rabbits Company of Parrots Company of Soldiers Compromise of Senators Conflagration of Arsonists Conflagration of Pyromaniacs Confusion of Meanderings Confusion of Traffic Cones Congregation of People Congregation of Plovers Congregation of Worshipers Congress of Baboons Consort of Corgwyn Conspiracy of Ravens Constable of Ravens Constellation of Satellites Constellation of Stars Constituency of Voters Convention of Tongues Convocation of Eagles Cornucopia of Slugs Corps of Cadets Coven of Witches Cover of Coots Covey of Grouse Covey of Partridges Covey of Pheasants Covey of Ptarmigans Covey of Quail Cowardice of Curs Crash of Rhinoceroses Crash of Software Creep of Tortoises Crew of Military Barbers Crowd of Onlookers Cruft of Hackers Crush of Icebergs Crush of Shoppers Cry of Hounds Cry of Players Culture of Bacteria Cupful of Starlets Cutch of Vellum Cutting of Cynics Dawn of Morning Glories Death-Row of Turkeys Debauchery of Hedonists Deceit of Lapwings Deck of Sailors Deficit of Economists Density of Meatheads Descent of Woodpeckers Design of Engineers Desperation of Divorcees Desperation of Voters Dilation of Pupils Disputation of Lawyers Dissimulation of Birds Divergence of Canadians Division of Soldiers Dole of Doves Donut of Data Doom of Dragons Dose of Doctors Down of Hares Draught of Fish Dray of Squirrels Drift of Hogs Drift of Icebergs Drift of Swine Dropping of Pigeons Drove of Cabbies Drove of Cattle Drumming of Grouse Duel of Doves Durante of Toucans Ecstasy of Morgans Embarrassment of Parents Embarrassment of Riches Encroachment of Fence-Builders Equanimity of Tranquilizers Ergo of Cartesians Erst of Bees Evensong of Choirboys Exaltation of Larks Fall of Woodcocks Falling of Dominoes Fascination of Listeners Fascination of On-Lookers Fesnyng of Ferrets Fidget of Altar Boys Fidget of Suspects Field of Racehorses Fistful of Dollars Flag of Americans Flap of Nuns Fleet of Ships Flight of Cormorants Flight of Doves Flight of Golf Balls Flight of Goshawks Flight of Refugees Flight of Stairs Flight of Swallows Flink of Cows Flitch of Bacon Float of Crocodiles Flock of Sheep Flock of Tourists Flock of White Christmas Trees Flood of Plumbers Flotilla of Ships Flourish of Blossoms Flunk of Students Flush of Wing Commanders Fluther of Jellyfish Fold of Chairs Formality of Penguins Formation of Geologists Freeze of Northerners Fright of Ghosts Gaggle of Geese Gaggle of Pill Poppers Galaxy of Starlets Galaxy of Stars Gallop of Greyhounds Gam of Whales Gambol of Dancers Gang of Elk Gang of Hoodlums Gatling of Woodpeckers Geek of Engineers Giggle of Girls Glacier of Freezers Glitter of Generals Glossolalia of Pentecostals Glut of Parrs Glut of Pleasure Gossip of Relatives Government of Episcopalians Greed of Lawyers Grind of Chores Grip of Hand Tools Grist of Bees Groan of Puns Gross of Farts Grove of Trees Grumble of Pugs Guilt of Pleasures Gush of Sycophants Hailstorm of Gun Ships Hamper of Helpers Hand of Bananas Handful of Palm Readers Harmony of Beauties Harmony of Singers Hassle of Errands Hatchet of Corporate Downsizing Proposals Heap of Front-End Loaders Heap of Trash Heard of Blind People Herd of Elephants Herd of Horses Herd of Pigs Herd of Wrens Hide of Tigers Hill of Beans Hiss of Lisps Hive of Bees Horde of Gnats Host of Angels Host of Sparrows Hover of Hummingbirds Hover of Trout Huddle of Hippos Huddle of Lawyers Huddle of Players Huff of People Who Write Letters to the Editor Hug of Teddy Bears Hum of Bees Husk of Hares Immersion of Baptists Imposition of In-Laws Incantation of Warlocks Incantation of Witches Incision of Surgeons Indecision of Managers Jackson of Gloves Jagger of Tongues Jam of Tarts Jungle of Nazis Kervorkian of I.U. Med Students Kettle of Drums Kettle of Hawks Kindle of Kittens Kneeling of Parishioners Knot of Eels Knot of Frogs Knot of Renters Knot of Scottish Bankers Knot of Shoelaces Knot of Toads Knuckle of Gangsters Labor of Moles Leap of Hares Leap of Leopards Leash of Foxes Leash of Hares Lechery of Priests Lie of Politicians Litter of Pigs Luck of Dice Lump of Toads Machination of Monkeys Magnum of Hit Men Mask of Raccoons Mass of Catholics Mass of Priests Maul of Bears Maze of Canyons Meaning of Dictionaries Medusa of Knots Meet of Racehorses Meeting of Quakers Melee of Rioters Membership of Presbyterians Mess of Grits Mess of Little Boys Mess of officers Mess of Pottage Mint of Candies Minuscule of Sub-Atomic Particles Minyan of Jews Mixture of Pharmacists Moan of Lamentations Mob of Kangaroo Mob of Texans Mug of Narcissists Multiplication of Loafers Murder of Crows Murmur of Alliterations Murmur of Nuns Murmuration of Starlings Muscle of Marines Muster of Peacocks Muster of Soldiers Muster of Storks Mustering of Storks Mute of Hounds Ménage of Mongrels Nag of Grandparents Nest of Bowls Nest of Machine Guns Nest of Mice Nest of Rabbits Nest of Vipers Nest of Wasps Network of Computers Nobility of Beasts Number of Mathematicians Nye of Pheasants Obscurity of Poets Observance of Hermits Orchestra of Crickets Orchestra of Musicians Order of Waiters Ostentation of Peacocks Pack of Hounds Pack of Suitcases Pack of Wolves Pad of Paper Paddling of Ducks Pail of Wasps Pair of Horses Pander of Toadies Pantheon of Gods Parade of Penguins Parliament of Owls Parliament of Rooks Party of Jays Passel of Brats Patch of Flowers Pathos of Mourners Patter of Footsteps Peal of Bells Peep of Chickens Pencil of Lines Pension of Condominiums Phalanx of Umbrellas Piddle of Puppies Pie-Full of Apples Pile of Dung Pinhead of Angels Pink of Liberals Piteousness of Doves Pithy of Truths Pitying of Turtledoves Plague of Locusts Plane of Geometrists Platoon of Soldiers Plump of Waterfowl Plump of Wildfowl Plunder of Goons Pod of Seals Pod of Whales Poke of Fencers Pomposity of Professors Ponder of Philosophers Pontificality of Prelates Posse of Cock-Turkeys Posse of Posers Prattle of Parrots Pretension of Intellects Prevarication of Consultants Prey of Nuns Prickle of Hedgehogs Prickle of Porcupines Pride of Lions Pride of Stage Mothers Propriety of Nouns Pryde of Griffins Pull of Silk-Screens Pumphouse of Egos Quake of Cowards Quake of Seismologists Quarrel of Lawyers Quaver of Arias Quiz of Teachers Rabble of Rats Rack of Gears Radiance of Cardinals Raft of Canvass-Back Ducks Raft of Ducks Raft of Widgeon Rafter of Turkeys Rain of Cats and Dogs Ramuda of Horses Rand of Objectivists Range of Mountains Ream of Bureaucrats Reflection of Narcissists Regatta of Swans Release of Anglers Remuda of Extra Cowboy Mounts Rhyme of Poets Richness of Martens Ring of Keys Rope of Pearls Round of Circumnavigations Round of Drinks Route of Wolves Rumble of Artillery Rumpus of Baboons Run of Cowards Run of Poultry Rush of Overnight Couriers Rush of Pochard Salon of Poodles Salt Substrate of Potato Chips Salt Substrate of Pretzels Salt Substrate of Saltines Salvo of Artillery Shells Scale of Ichthyologists Scandal of Shoes School of Fish Sea of Bishops Sedge of Cranes Set of Mathematicians Sheaf of Wheat Shoal of Bass Shoal of Goslings Shoal of Shad Shock of Corn Shortage of Dwarves Shrewdness of Apes Siege of Herons Singular of Boars Skein of Geese Skulk of Foxes Slate of Candidates Slew of Homework Slither of Gossip Columnists Slither of Snakes Sloth of Bears Smack of Jellyfish Smashing of Luddites Smuth of Jellyfish Sneak of Weasels Snap of Photographers Sodom of Shepherds Sord of Mallards Souffle of Clouds Sounder of Swine Sousa of Marching Bands Splash of Puddles Sprig of Vegetarians Spring of Seals Spring of Teal Sproutness of Mushrooms Squad of Soldiers Squash of Sermons Squeal of Nieces Squint of Proofreaders Staff of Employees Stand of Flamingo Stand of Trees Stash of Weed Steam of Turds Stench of Skunks Stock of Portfolio Managers Storm of Paratroops Strangle of Bad Laws Streak of Tigers Stretch of Giraffes String of Ponies Stripe of Zebras Stud of Mares Studk of Jellyfish Subtlety of Designers Sulk of Teenagers Superfluity of Nuns Superfluity of Priests Superfluity of Similes Swarm of Bees Swarm of Cockroaches Swarm of Dirty Ragged Plebeians Swarm of Harries Swarm of Literary Drones Swarm of Suitors Swarm of Sycophants Sweetness of Sopranos Swelter of Blankets Tangle of Tricksters Team of Athletes Team of Ducks Team of Horses Team of Oxen Tedium of Golfers Terror of Terriers Tick Tock of Clocks Tidings of Magpies Tilt of Windmills Tok of Capercailzies Tongue Lashing of Interpreters Totter of Giraffes Treachery of Spies Tribe of Goats Tribe of Monkeys Tribe of Natives Trip of Dotterel Trip of Goats Troop of Kangaroo Troop of Monkeys Troup of Performers Tumult of Tubas Tuz of Hair Tyranny of Dictators Ubiquity of Sparrows Undulation of Hills Unkindness of Ravens Vagary of Impediments Vane of Directions Vein of Goldfinch Vigor of Hybrids Vision of Optometrists Visit of Jehovah's Witnesses Volery of Birds Waddle of Basset Hounds Wailing of Weight Watchers Wake of Vultures Walk of Snipe Wash of Emotions Watch of Nightingales Wave of Surfers Wealth of Information Wedge of Geese Wedge of Swans Whale of Surfers Whistle of Modems Wiggle of Elvis Impersonators Wing of Fighter Aircraft Wisdom of Grandparents Wisdom of Owls Wisp of Snipe Wolf Pack of Submarines Wonder of Stars Wriggle of Worms Yoke of Oxen Yoke of Pilots