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f[]=1 f('[':a:b:c:d:s)=length[a..c]*f s f(a:s)=f s
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f[]=1 f('[':a:b:c:s)=length[a..c]*f s f(a:s)=f s
f[]=1 f(a'[':'-'a:b:c:d:s)=length[a..b]*fc]*f s f(a:s)=f s
f[]=1 f(a:'-':b:s)=length[a..b]*f s f(a:s)=f s
f[]=1 f('[':a:b:c'-':db:s)=length[a..c]*fb]*f s f(a:s)=f s
