ac is the start of a series related to "concentration".
(ac, bg, bu, bv, ce, dz ,ee, eb, fk, ga, hf, iz, jn, kw, lh, mh, ni, lx, pr, qo,
rq, sy, tl, ue, vo, vb, wh, xc, yk, zn, bz,ct,dy,ev,fs,ge,hu,il,je)
* Let the two circles overlap as much as possible.
We will pursue very simple and fun games.
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