deletions | additions       diff --git a/layout.md b/layout.md  index ae8083d..eaf3c51 100644  --- a/layout.md  +++ b/layout.md 
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Then_vec_v_t_Delta__.tex  Or_frac_vec_x_t__.tex  From_3_vec_a_t__.tex  vec_a_t_Delta_t__.tex vec_a_t_vec_a__.tex