deletions | additions       diff --git a/layout.md b/layout.md  index 5992635..44c1de7 100644  --- a/layout.md  +++ b/layout.md 
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First_step_in_Velocity_Verlet__.tex  Below_is_a_draft_Don__.tex  vec_a_t_vec_a__.tex  widetilde_vec_v_t_Delta__.tex