Select all values of {{MATH_219}} where the function {{MATH_220}} has an inflection point. {{CMD_221}} {{CMD_222}}{{MATH_223}}{{CMD_224}} {{CMD_225}}{{MATH_226}}{{CMD_227}} {{CMD_228}}{{MATH_229}}{{CMD_230}} {{CMD_231}}{{MATH_232}}{{CMD_233}} {{CMD_234}}{{MATH_235}}{{CMD_236}} {{CMD_237}}{{MATH_238}}{{CMD_239}} {{CMD_240}}{{MATH_241}}{{CMD_242}} {{CMD_243}}{{MATH_244}}{{CMD_245}} {{CMD_246}}{{MATH_247}}{{CMD_248}} {{CMD_249}}{{MATH_250}}{{CMD_251}} {{CMD_252}} {{CMD_253}}