Contemplate the data and tweets to guess whether the closing price of $gd will surge or decline at 2015-07-31. Please declare either Rise or Fall.
Context: date,open,high,low,close,adj-close,inc-5,inc-10,inc-15,inc-20,inc-25,inc-30
2015-07-17,-0.0,0.1,-1.1,0.1,0.1,-0.8,-2.0,-2.6,-2.7,-2.9,-3.5
2015-07-20,-0.2,0.2,-0.4,0.2,0.2,-0.6,-1.9,-2.7,-2.8,-3.0,-3.5
2015-07-21,1.5,1.6,-0.6,-1.8,-1.8,1.1,0.1,-0.6,-0.9,-1.0,-1.5
2015-07-22,0.6,0.8,-0.7,-0.7,-0.7,1.6,1.1,0.2,-0.2,-0.2,-0.6
2015-07-23,0.6,1.1,-0.1,-0.3,-0.3,1.4,1.4,0.6,0.1,0.1,-0.2
2015-07-24,1.5,1.5,-0.2,-1.5,-1.5,2.1,2.8,2.1,1.6,1.6,1.3
2015-07-27,-0.2,0.4,-0.4,-0.1,-0.1,1.3,2.6,2.2,1.7,1.6,1.5
2015-07-28,-0.9,1.1,-1.0,1.3,1.3,-0.3,1.1,0.9,0.5,0.3,0.2
2015-07-29,-0.5,2.3,-0.6,3.9,3.9,-3.4,-2.5,-2.5,-3.1,-3.3,-3.4
2015-07-30,-0.2,0.6,-0.4,0.2,0.2,-2.9,-2.6,-2.5,-3.0,-3.4,-3.4

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2015-07-19: $twtr twitter inc      $syn $mwe $mdxg $dhr $nat $googl $stng $amzn $bsbr $ko $psx $bud $hig $kkr $jnj $sti $gd $wm
2015-07-21: $gd:jp morgan rating update on general dynamics corporation (nyse ...:|analyst favorites with strong buyback activity: general dynamics ranks as a top pick $gd #stocks 
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2015-07-29: $gd reported earnings of $2.27, consensus was $2.03, earnings whisper was $2.10 via AT_USER #whisperbeat |general dynamics corp $gd 10-q now available
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Answer:
Fall