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\subsection{Steps of the Challenge}  \label{ssec:steps}  The initial challenge consists of two steps, hereafter time-delay challenge 0 and 1 (TDC0 and TDC1). Each time delay challenge is organized as a ladder with a number of simulated light curves at each rung. The rungs are intended to represent increasing levels of difficulty and realism within each challenge. The simulated light curves were created by the "evil team" (GD, CDF, PJM, TT). All the details about the light curves, including input parameters, noise properties etc, will be revealed to the teams participating in the challenge (hereafter "good teams") only after the closing of the challenge.  TDC0 consists of a small number of simulated light curves with fairly basic properties in terms of noise, sampling, cadence. It is intended to serve as a validation tool before embarking in TDC1. The evil team [{\bf CDF: Have we defined ``good'' and ``evil'' at this point??}] expects that state of the art algorithms should be able to process TDC0 with minimal computing time and recover the input time delays within the estimated uncertainties. TDC0 also provide a means to perform basic debugging and test input and output formats for the challenge. Good teams are required to successfully meet the TDC0 criteria before embarking in TDC1. The outcome of TDC0 will be a pass/fail response granting access to TDC1.