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* exclude 'helix/rev3_4rows' from CI Since helix/rev3_4rows is almost the same as helix/rev3_5rows, there is no point in checking with travis-ci. * include 'helix/pico/back' to CI helix pico and helix rev2 are still available. I would like to check both by travis-ci, but here I will add a check only for helix pico.