ISBN2 by 51b

char*p,s[];x;main(i){for(;gets(s);)for(p=index(s,63),*p=58;--*p>47;x%(11-i%2)||puts(s))for(x=0,i=3;s[++i];)x+=s[i]%30*(s[14]?i%2*2+1:14-i);}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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