You are playing for the first time with a competent player, you have discussed CRASH as your defense to strong club systems, and assume it would follow here (where X, 2N, and 3C are going to be conventional 2-suiters, & everything else natural). Opponents have lots of masterpoints due to the number of tournaments they attend, but have mediocre skill/judgement. Lefty considered a few seconds before opening 2C, which is strong, forcing, and artificial.
Over to you.

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