Page 236 - Mind Games The Aging Brain and How to Keep it Healthy
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220 • Chapter 7



                                                     ?                       a       b
                                     6.
                                                                             c       d


                                                            ?      a       b
                                     7.
                                                                   c       d



                                                                                a      b
                                     8.                            ?
                                                                                 c     d

                                                                ?
                                     9.  1,  6,  16,  21,  31,




                                                                         a         b
                                    10.                            ?

                                                                         c         d




                                          ?
                                    11.            a        b       c        d



                                                                                 a      b
                                                                            ?
                                    12.   ,   ,    ,
                                                                                  c     d


                                                             ?
                                    13.
                                                                    a     b      c      d


                                                        ?
                                    14.  1,  3,  9,  27,
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