a             b             c             d             e             f             g             h
happy|sad|      happy |sad    | happy | happy |sad |happy
i             j             k             l             m             n             o             p
happy|sad|    sad|    happy|  sad|    happy|      sad|     sad
q             r             s             t             u             v             w             x
sad|   sad|       sad|        sad| happy|    sad|        happy|    sad
y             z  
sad| happy


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