Remove unnecessary '+ 1' for pretty move half
Remove unnecessary '+ 1' for pretty move half

When move half run,

- R2f
  - Before
    - Rear: 2n+1, Front: 0 -> Rear: n+1, Front:   n
    - Rear:   2n, Front: 0 -> Rear: n+1, Front: n-1
  - After
    - Rear: 2n+1, Front: 0 -> Rear:   n, Front: n+1
    - Rear:   2n, Front: 0 -> Rear:   n, Front:   n

It is same for F2r if switch the Rear and Front.

potatosalad/otp,emacsmirror/erlang,bjorng/otp,emacsmirror/erlang,rlipscombe/otp,dumbbell/otp,dgud/otp,g-andrade/otp,potatosalad/otp,dgud/otp,erlang/otp,g-andrade/otp,isvilen/otp,dumbbell/otp,g-andrade/otp,emacsmirror/erlang,mikpe/otp,vinoski/otp,potatosalad/otp,jj1bdx/otp,erlang/otp,isvilen/otp,dumbbell/otp,jj1bdx/otp,dumbbell/otp,erlang/otp,isvilen/otp,erlang/otp,rlipscombe/otp,mikpe/otp,mikpe/otp,emacsmirror/erlang,potatosalad/otp,potatosalad/otp,g-andrade/otp,dumbbell/otp,vinoski/otp,erlang/otp,rlipscombe/otp,bjorng/otp,dgud/otp,bjorng/otp,emacsmirror/erlang,mikpe/otp,potatosalad/otp,mikpe/otp,jj1bdx/otp,erlang/otp,isvilen/otp,erlang/otp,isvilen/otp,bjorng/otp,g-andrade/otp,rlipscombe/otp,vinoski/otp,potatosalad/otp,g-andrade/otp,emacsmirror/erlang,bjorng/otp,erlang/otp,dgud/otp,dgud/otp,g-andrade/otp,bjorng/otp,isvilen/otp,rlipscombe/otp,vinoski/otp,emacsmirror/erlang,emacsmirror/erlang,vinoski/otp,potatosalad/otp,dumbbell/otp,isvilen/otp,dumbbell/otp,emacsmirror/erlang,vinoski/otp,rlipscombe/otp,rlipscombe/otp,dgud/otp,jj1bdx/otp,jj1bdx/otp,mikpe/otp,isvilen/otp,bjorng/otp,bjorng/otp,g-andrade/otp,jj1bdx/otp,mikpe/otp,dgud/otp,mikpe/otp,jj1bdx/otp,dumbbell/otp,rlipscombe/otp,g-andrade/otp,dumbbell/otp,erlang/otp,mikpe/otp,rlipscombe/otp,vinoski/otp,potatosalad/otp,dgud/otp,dgud/otp,isvilen/otp,emacsmirror/erlang,dumbbell/otp,vinoski/otp,potatosalad/otp,bjorng/otp,vinoski/otp,mikpe/otp,dgud/otp,jj1bdx/otp,jj1bdx/otp,g-andrade/otp,vinoski/otp,isvilen/otp,jj1bdx/otp,rlipscombe/otp,bjorng/otp,erlang/otp