AN Nudeg) deg)uNdeg)u NZ'NN... N NNE uu NNNuNN N(deg)*(deg)NNA N... ?Nu1/2N N(deg)' Nu?Nu (deg). sN*NN 1/2u ?NN(deg)1/2?NN 1/2c, (deg) Nu NNNNN 1/2u deg)u'NN 1/2NE Nu . A N 1/2u N 'u uNNA NN, N?1/2u1/2N 1/2u deg)NN(deg)1/2N N 1/2N N(deg)N ?N.... E u1/21/2? N(deg) N N?*'(deg) 1/2NNZ, N N 'Nu * NNN... uN (deg)N?A.-N? (deg)?u N?N(deg)1/2u NN?N' ?N ?1/2(deg)1/2' NE u'N...(deg) A ?N...(deg)u'(deg) 1/2 (deg)NE '(deg) NA A (deg)NN (deg) ? N 2(deg)1/2? ? NN Ndeg)NZ NN'uNNNuNN u NuN(deg)1/2N 1/2 NN '(deg)NNNu1/21/2?' NN u, ?N?N?u 1/2Ndeg)?NNA N u 1/2*1/2Nu1/2N 1/2NNN? ??N?1/2N "e;N N 1968 'N .-N NN?N N(deg)NN*N(deg)NZN ? N ?N?N , NN?NNu' deg) NNNuNuNA 1/2N N?NN? "e;N N ?N (deg)u1/2NA NE N 1/2? N?N? ?NN(deg) '? uN 1/2N?'1/2? u ?N(deg) NuN'Nu ?(deg)NA 1/2? *1/2uN. z1/2 N NNN NZN N?NZNNZ zNSu'1/2u1/21/2NN... N(deg)NN... -N(deg)N? ?N ?Nu' 'u '? NNN(deg)1/2N, u ?uu 195 1/2N?1/2NA 1/2?NNu' N N N(deg)?N(deg)NZN Nu, N?1/2 N?NuN(deg)1/2. E ?1/2 N(deg)NNN(deg)NZN 'u1/2u Nu?u, NNA u NNNuu1/2u, NuNE NuNA 1/2?NNNA ?N 1/2 N N N N uN...N NN(deg) uu1/2'(deg)N1/2N.' NNN... NN?NNN... deg)NZNu1/2? NuN'Nu NE u'N...(deg) A ?N...(deg)u'(deg), NN '(deg)NNNu1/21/2? 'uNNuN, 1/2u*'1/2, ?NN(deg) 'uN(deg). z1/2 1/2 N(deg)1/2N N NuNA NZ '?N...1/2?NNNA 1/2NNN?(deg)NNA 1/2?Nu ? u1/2N NN(deg)Nuu', (deg) N(deg)u ?NuNNNA '?NNu1/2N NN?' ??'?' NN ' 1/2N NuN... NZ'u', ?N?NNu uu NNNN?(deg).-N? NuNN?(deg)1/2u *1/2 NN u1/2 1/2N?'N 1/2u*u? NNuNNN 1/2u ?1/2N. s(deg) ?NuNdeg)uN N NE u'N... A ?N...(deg)u', 1/2?u uNu Nu'NN?N N'uNNA . z'1/2?, deg) NNA uN2NN... NN'uNNN uN - NN? N'(deg)NZNuuNN 1/2Nu'u. "e;NN u N (deg)N NE u'N...(deg) A ?N...(deg)u'(deg), NNE u'NE u *'(deg)NuNA NNu Explorer, NZNdeg)NZN -(deg)'u', (deg)*NNE u1/2N ? NNdeg)NNNA u ?*N1/2? N??N NNN, E NNN NNN...? "e;(deg) uN?NuNN... 'uN(deg).