16e06f929ce3f675c5e535d06ffb02ff7.png"
                                                   alt="C"/> interacts instantly with <img class="math"
                                                                                           src="../_images/math/4bc3e94a67870b41b7c20179693e889251e2c136.png"
                                                                                           alt="B"/> at the 50th minute
                        (we have <img class="math" src="../_images/math/178ad689c53195af6d9