Comb<Mint>c;
ll@d,@l,@r,@k;
(l,r)=Ilog2_f((l,r));
Mint p=(l+r-k&1)<(r-l<=k<=l+r);
p*=c.fac(1<<(0..d-1));
ll m=l+r-k>>1;
wt(l<r?p/(1<<m+(l>m)):p/((1<<r)-1)*(1<<r-m-1));