which ship class has an overall length no more than 50.0?
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m.0br_wcj m.0g3lrz m.08h51x g.11dyl76c0 m.0272wr7 m.064p39c m.0_qgfpq m.07kg85y m.012c6cr0 m.021wcx m.0gvsths m.0dfy46 m.02pnxxb m.04gw8ry m.0fqqqd_ g.11jgf5hwx m.02qrpqp g.11dyjr05n m.0bs99f_ m.0gvpj2 m.0bby127 m.0j45lz4 m.0d4wsk m.04n5tfd m.0j63nmj g.11dyl_61j m.06h2rx m.02682zv g.11dyhtmmq m.0gfhwpt m.07bv8s m.0gkz4kp m.05xrmp g.11dyl04_7 g.11dyl75_t g.12288vpg m.0gkyydz m.024js1 m.025y_5c m.026f691 m.026s9xl m.0274v8n m.0274vcr m.0276fgq m.0277p4s m.0277tmj m.027mggl m.027rz46 m.028859 m.0288jnh m.02fbbj m.02hgmv m.02lnsd m.02p__sd m.02ph7zv m.02q9k_c m.02qlcty m.02r3pr9 m.02r6k0 m.02rmypq m.02vmh35 m.02vy83k m.02vz_z6 m.02x65b8 m.02x6vch m.02xrf4 m.0303vw m.0309v7 m.0340gh m.0349n7 m.039s87 m.03_sq9 m.03byyg0 m.03byyjf m.03bzx7s m.03c0csc m.03c0x3b m.03c12n2 m.03c35zz m.03c73_f m.03chvp9 m.03cj236 m.03cmlt5 m.03cwbx2 m.03cxtdq m.03d0pdq m.03d1l19 m.03d5d5f m.03dwc1 m.03g_btl m.03hjf90 m.03hkrr m.03hlxl_ m.03m6lv9 m.03mmss m.03pfw8 m.03qjt4_ m.03wf980 m.03wfp3p m.03wfwx3 m.043m_lf m.044wbg m.04790x4 m.047cg8x m.047ds5w m.047fk6d m.047r07y m.04_95w m.04dyzgr m.04f2lz m.04fglb m.04gkdfq m.04gvmxf m.04jdk8l m.04jf2gx m.04jf49w m.04jn3kn m.04lfyb7 m.04n2psp m.04n4b43 m.04njqk m.04p29_ m.04pr0d m.04qw6b m.04zykn9 m.0515tf m.053l4b m.0557cz m.05fts8 m.05g8nr m.05k2__ m.05lm3f m.05mr_16 m.05r_b6 m.05s_lzm m.05zs7dy m.05zzn6f m.0626rj m.063_v3_ m.0641yx m.064ggv m.066nrbn m.06_tyqg m.06cgt5 m.06htzl m.06p8_3 m.06sf4q m.06w5n34 m.0729g6 m.07cx9b m.07g3mg m.07lxkc m.089mnz m.08qftk m.08r0mm m.08tcnn m.09pvz6 m.09rk_9 m.09t6dg m.09x8ng m.0b6nf9 m.0b77tnb m.0bh78l m.0bmcr6z m.0bq4_k m.0br_r3w m.0by8k1 m.0cdw__ m.0cfn2d m.0cj9zt m.0cmt49 m.0cnqpv m.0cr41c m.0cr82z m.0crqhl m.0crxn0 m.0cy4bw m.0czphd m.0d01jy m.0d4wm9 m.0d50by m.0d5cbd m.0d5xr0 m.0d5yt6 m.0d5ywc m.0d5z76 m.0d62yr m.0d9nfw m.0d__kp m.0dd82r m.0dhf5b m.0dmn4f m.0dwf1n m.0f0rpy m.0f94jv m.0ff3_j m.0fh_vg m.0g1ct7 m.0g1ssw m.0g384r m.0gby2s m.0ghbjr m.0gnn1j m.0gqf40 m.0gygg9 m.0gynsn m.0l3vm m.0zgcw9d g.120y85g0 m.0j42ngb m.06gffb m.010fl0ln m.07s8v1x m.06w64vm g.11dylm_71 m.026t06l m.0268ly1 m.098m5n m.0gkyl6w m.0crd0nr g.11dykv1qj g.11dylm9s1 m.0wbmsvx g.11b5m4psj5 g.11b6bv9sc4 g.11b6bxc1v6 g.11dyhsxyw g.11dyhvgx7 g.11dyhyv3b g.11dyj6872 g.11dyj83xs g.11dyj8p5t g.11dyjgrpg g.11dyjr03h g.11dyjtffs g.11dyjyzqh g.11dyjznbt g.11dyjznkn g.11dyk19_v g.11dyk36gc g.11dyk6d08 g.11dykbc11 g.11dykg65p g.11dykjt0d g.11dykl241 g.11dykrxrl g.11dykrxy0 g.11dykv235 g.11dykvw11 g.11dyl04xy g.11dyl0hf8 g.11dyl1whb g.11dyl6wb6 g.11dyl8688 g.11dyl91tb g.11dylhw3t g.11dylkb29 g.11dyllnhy g.11dylm9th g.11dylph95 g.11dylrnnr g.11dylrttl g.11dylw5zn g.11dylxbp7 g.11dylxj4q g.11jgd_h7p g.120qdf7z g.120wl69r g.121r2b9s g.121w182s g.121y9xl0 g.12204459 g.122pkc4y g.122tpqgj g.123dm6v14 m.0102k63m m.0113_12t m.0113p72k m.011f164y m.012bzr8n m.012c1f4p m.012c5h55 m.012c5j2l m.012c5ps3 m.012c68ps m.012c8mxs m.012c8ndh m.012c8vf0 m.012c8xly m.012cf3xy m.012ds628 m.012j36pk m.012l6hx6 m.012lbfct m.012lbfh5 m.012ln7bd m.012srj4c m.03wdr98 m.043mqzn m.04_11w4 m.04jk70v m.05239s_ m.064m125 m.06gdlt m.06gfq9 m.06w33fz m.06yjcc m.080gxmb m.080kdy8 m.08w857 m.08z47t m.0_1mdz9 m.0_1mhyz m.0_lnhnp m.0b6d0xw m.0b6dm4v m.0b6jdkn m.0b6m7j9 m.0b6p2dh m.0b77fjx m.0bhbfmx m.0bmf6x0 m.0br_9j2 m.0bs04mx m.0bs06z_ m.0bs12dk m.0bs1rfd m.0bs520d m.0bs77wx m.0bwg7k7 m.0dgrtm9 m.0g5rwdl m.0g9v5g5 m.0g9xchc m.0gfgnw9 m.0gky9rp m.0gky_8v m.0gkz7y3 m.0gmd7wg m.0gmgfxr m.0gvtmz1 m.0gvtyf3 m.0h559hw m.0h67lqs m.0h7l8td m.0h97cl3 m.0hnb5yp m.0hnb86t m.0hrfmyf m.0j42rz4 m.0j43vdn m.0j45s7t m.0j67fvj m.0j_6mn2 m.0ngtbf2 m.0ryv4c9 m.0y7t14p g.1215vkjt m.0gls20p m.0bwm2k_ g.1238rz8h m.0d4n3k m.0cz8gf1 m.0cp1r2 m.0j45c7_ m.012cf2jf
RS Tera Scorpion Jet 14 null RS Vareo Splash SCAMP Swallow Kraken 25 Mirror RS Elite RS800 J/105 Tree-class trawler Comet null Hai null 6.5 Metre C-Lark PocketShip Pacific Seacraft 31 Tempest SKUD 18 Bowman 45 null SB20 River-class minesweeper null No.1-class auxiliary patrol boat Fireball Swan 45 Firefly null null null Techno 293 Heron Beachcomber 6.5 Pirate Melges 32 Force 5 Olson 30 Contessa 26 Laser 3000 Pearson Renegade Sunburst Jacksnipe Albacore IF-boat Topper Enterprise Laser Farr 40 Dublin Bay 24 Winkle Brig Catalina 22 Jolly Boat Streaker Miracle 2000 Hornet Pearson Ensign Woodpussy Sydney 38 Flying Scot Nordic Folkboat Etchells National 12 Star Wayfarer Shark 24 Tadpole Frog Windmill X boat Penguin Thunderbird 26 Banshee Pearson Ariel Class40 Bosun ASC Phantom Hilbre One Design Blaze Reedling Graduate 470 Vaurien RS400 Europe Pelican NS14 Javelin dinghy Yngling Flying Ant Melges 20 Laser Vago Windy Starling Thistle Butterfly 29erXX Dabchick Front Runner J/27 Moore 24 RS600 Albin Vega Ross 930 Gull Dart 18 Mermaid Kestrel SL 16 Dart 16 First Class 8 Illusion OE 36 Laser Radial Laser 4.7 International 420 Class Dinghy Sunfish Beaufort Musto Performance Skiff Lightning 505 J/22 J/24 OK Byte Salcombe Yawl Puddle Duck Racer RS600FF Payne-Mortlock sailing canoe RS500 Sabot Stealth Melges 24 Hobie 16 Fanatic Ultra Boa Elliott 6m Laser 2 Buccaneer Highlander Laser Pico O-Jolle Manly Junior Snipe Laser 4000 San Juan 24 Shields sailboat Spiral Wanderer Tasar Sabre Lark 18ft Skiff Flying Junior Pearson Triton International C-class catamaran Sonar Snowbird 11:Metre One Design Mistral One Design Class Vanguard 15 Moth A-Scow Melges 17 Otter RS300 I-20 MC Scow C-Scow M Scow E-Scow Open Ocean Performance Sixties Volvo Open 70 Dragon H-boat Flying Fifteen Solo Tartan Ten Mutineer 15 Zoom 8 Y flyer British Moth Redwing Cherub Zeddie RS200 Snark sailboat P-class yacht San Juan 21 Zephyr Minto Sailing Dinghy RS Feva Day Sailer Vagabond Flying Tiger 10 M International Canoe International 110 Contessa 32 JY15 Precision 15 Knarr Tempest 23 null Rustler 36 USCG Deployable Pursuit Boat Nippa Buzz 12 foot dinghy null CL 16 Sprint 15 Zobel-class fast attack craft TP 52 Laser 5000 null null Weta Trimaran null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null Solution Herreshoff 12½ X1 Daring Farrier F-22 Trojan 750 Crowther Buccaneer 28 Farrier Trailertri 18 Bunyip 20 Kraken 18 Avalon 9 Aussie Farrier F-27 Avalon 8.2 Venta Naramatac Lodestar WindRider 10 Discovery 20 Neel 45 Multi 23 Kraken 33 Mk IV L boat Cape Codder Hunter Medina 20 Mark 125 RS700 Transportable Port Security Boat USCG Utility Boat Pearson Wanderer Mark V Special Operations Craft J/80 Bombardier Invitation International 806 Formula 18 Swan 36 Swan 65 Fareast 18R Access 303 Beneteau Wizz Bez 2 Trailer Sailer B14 International Access 2.3 Naples Sabot Coronado 15 Tsurugi-class patrol vessel 12m² Sharpie 10 Metre 7 Metre 8.5 Metre French National Monotype 1924 18 foot dinghy 9 Metre S&S 34 O'pen BIC Loch Long One Design No.1-class auxiliary submarine chaser No.1-class auxiliary minelayer No.1 class auxiliary minesweeper Farr 30 Platu 25 J/30 Ultimate 20 Access Liberty RS100 RS Quba Envy Club 420 RS Venture AC72 X-99 Sydney 40 ISO Pacific Seacraft 40 Pacific Seacraft 37 Pacific Seacraft 34 Bowman 42 Albatroz-class patrol boat Sol Cat 18 Conrado Yap-class patrol craft Finn Express 64 null RS Vision Impulse null German Type XVII submarine Interlake Chamsuri-class patrol boat Pacific Seacraft 44 Centaurus II
class literal
boats.ship_class 50.0^^http://www.w3.org/2001/XMLSchema#float
boats.ship_class type.float
Ship class 50.0
none <=
boats.ship_class.length_overall_m
Length overall
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :boats.ship_class . 
FILTER (?x1 <= "50.0"^^<http://www.w3.org/2001/XMLSchema#float>)
?x0 :boats.ship_class.length_overall_m ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND boats.ship_class (le boats.ship_class.length_overall_m 50.0^^http://www.w3.org/2001/XMLSchema#float))