A liquid epoxy resin composition is provided comprising a liquid epoxy resin, an optional curing agent, a curing accelerator, an inorganic filler, and acrylic submicron particles of core-shell structure formed of polymers or copolymers comprising an alkyl acrylate andor alkyl methacrylate as a monomeric component, the core having a Tg of up to 10 C. The flexible waveguide comprises a flexible material having a surface and an end, wherein a first portion of the light is emitted through at least a portion of the surface of the flexible waveguide, and a second portion of the light is emitted through the end. The extracted one or more features are compared to cached features stored in one or more entries of a question and answer cache.