user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: what dimension is measured by a measuring instrument with a subclass of integrated electronic piezoelectric accelerometer? 
Knowledge Triplets: T-Mobile myTouch 3G Slide, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
LG Optimus Chat, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
HTC 7 Surround, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Samsung Focus, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
m.0xp7pb0, dataworld.gardening_hint.last_referenced_by, Accelerometer
Integrated electronic piezoelectric accelerometer, measurement_unit.measuring_instrument.subclass_of, Accelerometer
Sony Ericsson W760, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Sony Ericsson W595, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Gravimeter, measurement_unit.measuring_instrument.subclass_of, Accelerometer
Laser accelerometer, measurement_unit.measuring_instrument.subclass_of, Accelerometer
Samsung Omnia 7, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Accelerometer, measurement_unit.measuring_instrument.subclasses, Gravimeter
Accelerometer, measurement_unit.measuring_instrument.subclasses, Integrated electronic piezoelectric accelerometer
LG Optimus 2X, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
LG Optimus Chic, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Sony Ericsson W580i, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
HTC Desire Z, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
LG Optimus 7, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
HTC Titan II, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Samsung Omnia W, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Nexus One, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Nokia C6-00, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Accelerometer, computer.computer_peripheral.supporting_games, Zombie Ball
Acer Allegro, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
HTC Inspire 4G, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
BlackBerry Storm, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Samsung Focus S, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Samsung Replenish, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
HTC Evo Shift 4G, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Accelerometer, measurement_unit.measuring_instrument.subclasses, Laser accelerometer
Sony Ericsson Xperia X10, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
HTC Desire S, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
accelerometer.noun.01, base.wordnet.synset.equivalent_topic, Accelerometer
Nokia 5250, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Accelerometer, measurement_unit.measuring_instrument.subclasses, PIGA accelerometer
Nexus S, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
LG Optimus Zip, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Nokia X3-00, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
HTC Hero, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
LG Quantum, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
ZTE Tania, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
LG Optimus One, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
m.07vn7ph, base.yupgrade.user.topics, Accelerometer
Cyril Moutran, base.yupgrade.user.topics, Accelerometer
HTC Aria, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Nokia X5, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Sony Ericsson Xperia arc, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Sony Ericsson W910i, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Accelerometer, user.avh.default_domain.ellerdale_topic.ellerdale_id, 009b-6cb6
HTC Desire, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
m.09rnw3p, dataworld.gardening_hint.replaced_by, Accelerometer
PIGA accelerometer, measurement_unit.measuring_instrument.subclass_of, Accelerometer
HTC Radar, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Ana Marie Cox, base.yupgrade.user.topics, Accelerometer
Sony Ericsson Xperia arc S, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Palm Pre 2, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Fujitsu Toshiba IS12T, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Palm Pixi, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Sony Ericsson Xperia X8, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
davewiner, base.yupgrade.user.topics, Accelerometer
HTC 7 Trophy, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Xperia Play, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Sony Ericsson Xperia mini, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
m.06h_8hr, base.yupgrade.user.topics, Accelerometer
m.06wft1x, base.yupgrade.user.topics, Accelerometer
Nokia X7-00, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
HTC Touch Diamond, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
m.07vn9v7, base.yupgrade.user.topics, Accelerometer
Accelerometer, measurement_unit.measuring_instrument.subclasses, Piezoelectric accelerometer
Accelerometer, measurement_unit.measuring_instrument.dimension_measured, Proper acceleration
Droid Incredible, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Huawei U8800, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Nokia 5230, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
HTC 7 Mozart, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
HTC Magic, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Sony Ericsson Z750, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
HTC Desire HD, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Samsung Galaxy Note, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
HTC HD7, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
BlackBerry Bold 9900, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Dell Venue Pro, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Samsung Galaxy S4, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Sony Ericsson Xperia pro, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Nokia X6, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Nokia C5-03, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Nokia N97, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
BlackBerry Bold, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Droid X, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Sony Ericsson Xperia neo, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
LG Optimus Black, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Samsung Galaxy Ace, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
HTC Wildfire S, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
HTC Dream, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Samsung Galaxy S II, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Palm Pre, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Proper acceleration, measurement_unit.dimension.instruments, Accelerometer
HTC HD2, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
T-Mobile myTouch 4G, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Nokia 5800 XpressMusic, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Accelerometer, base.schemastaging.context_name.pronunciation, g.125_p7dgj
LG Optimus, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
Zombie Ball, cvg.computer_videogame.peripherals_supported, Accelerometer
Piezoelectric accelerometer, measurement_unit.measuring_instrument.subclass_of, Accelerometer
HTC Evo 4G, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer
HTC Titan, user.robert.mobile_phones.mobile_phone.input_interface, Accelerometer

Answer: Proper acceleration