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The authors would like to acknowledge J. Mergo, T. Beatus, and Y.-W. Lin for technical help and useful discussions on apparatus design. Because this technique took years to develop many individuals contributed to its design. The original prototype was developed by I. C. in collaboration with T. G. Mason and D. A. Weitz. The current version of the multiaxis piezo actuator and uniaxial FMD were developed by J. H. M., J.N.I., and I. C., the biaxial shear protocols and FMD were developed by N.L., J.N.I, and I. C. In addition, the arduous work of developing mechanical and optical calibrations, method development, and developing operating procedures were worked on by N.L., X. C., B. L., and J. H. M. This publication was based on work supported by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST), the National Science Foundation (NSF) under Grant No. DMR 1056662; the (U.S.) Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award No. ER46517, and in part under National Science Foundation CBET-PMP Award No. 1232666. J. H. M. was funded in part by Colby College, B. L. acknowledges the DoD, (U.S.) Air Force Office of Scientific Research (USAFOSR), National Defense Science and Engineering Graduate (NDSEG) Fellowship 32 CFR 168a. J.N.I was supported by the Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Award No. DE-FG02-87ER-45331, and by the National Science Foundation Grant No. CHE-1059108.