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            | 
                    Closing price on 4/11/2018
                 |  |  
    
        |           
                
                    | Open | 2.90 |  
                    | High | 2.90 |  
                    | Low | 2.80 |  
                    | Volume | 103,400 |  
                    | Split-adjusted Price | 1.98 |  
                
             | 
 |  MST Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 4/11/2018 | 0.00 / 0.00% | 2.90 | 2.90 | 2.80 | 2.90 | 2.89 | 1.98 | 103,400 |   |  
            | 4/10/2018 | -0.10 / -3.33% | 3.00 | 3.10 | 2.90 | 2.90 | 2.95 | 1.98 | 457,400 |   |  			
            | 4/9/2018 | -0.10 / -3.23% | 3.10 | 3.10 | 3.00 | 3.00 | 3.04 | 2.05 | 265,500 |   |  
            | 4/6/2018 | 0.00 / 0.00% | 3.00 | 3.20 | 3.00 | 3.10 | 3.10 | 2.11 | 355,000 |   |  			
            | 4/5/2018 | -0.10 / -3.13% | 3.20 | 3.20 | 3.10 | 3.10 | 3.11 | 2.11 | 41,700 |   |  
            | 4/4/2018 | -0.10 / -3.03% | 3.30 | 3.30 | 3.20 | 3.20 | 3.20 | 2.18 | 405,300 |   |  			
            | 4/3/2018 | +0.20 / +6.45% | 3.10 | 3.30 | 3.00 | 3.30 | 3.18 | 2.25 | 524,100 |   |  
            | 4/2/2018 | -0.10 / -3.13% | 3.20 | 3.20 | 3.00 | 3.10 | 3.12 | 2.11 | 473,100 |   |  			
            | 3/30/2018 | -0.10 / -3.03% | 3.30 | 3.30 | 3.20 | 3.20 | 3.29 | 2.18 | 173,300 |   |  
            | 3/29/2018 | +0.20 / +6.45% | 3.10 | 3.30 | 3.10 | 3.30 | 3.21 | 2.25 | 450,620 |   |  			
            | 3/28/2018 | +0.10 / +3.33% | 3.00 | 3.10 | 3.00 | 3.10 | 3.09 | 2.11 | 493,930 |   |  
            | 3/27/2018 | 0.00 / 0.00% | 3.00 | 3.20 | 3.00 | 3.00 | 3.09 | 2.05 | 322,400 |   |  			
            | 3/26/2018 | -0.10 / -3.23% | 3.10 | 3.10 | 3.00 | 3.00 | 3.09 | 2.05 | 532,400 |   |  
            | 3/23/2018 | +0.10 / +3.33% | 3.00 | 3.20 | 2.90 | 3.10 | 3.01 | 2.11 | 807,790 |   |  			
            | 3/22/2018 | -0.20 / -6.25% | 3.20 | 3.20 | 3.00 | 3.00 | 3.10 | 2.05 | 304,400 |   |  
            | 3/21/2018 | +0.10 / +3.23% | 3.10 | 3.30 | 3.00 | 3.20 | 3.12 | 2.18 | 402,410 |   |  			
            | 3/20/2018 | +0.10 / +3.33% | 2.90 | 3.20 | 2.90 | 3.10 | 3.02 | 2.11 | 772,880 |   |  
            | 3/19/2018 | -0.20 / -6.25% | 3.20 | 3.20 | 3.00 | 3.00 | 3.07 | 2.05 | 427,500 |   |  			
            | 3/16/2018 | +0.20 / +6.67% | 3.00 | 3.20 | 2.90 | 3.20 | 3.07 | 2.18 | 287,415 |   |  
            | 3/15/2018 | -0.20 / -6.25% | 3.20 | 3.20 | 3.00 | 3.00 | 3.04 | 2.05 | 562,360 |   |  			
            | 3/14/2018 | -0.20 / -5.88% | 3.40 | 3.50 | 3.10 | 3.20 | 3.25 | 2.18 | 939,102 |   |  
            | 3/13/2018 | +0.30 / +9.68% | 3.10 | 3.40 | 2.90 | 3.40 | 3.15 | 2.32 | 389,100 |   |  			
            | 3/12/2018 | -0.30 / -8.82% | 3.30 | 3.70 | 3.10 | 3.10 | 3.38 | 2.11 | 697,500 |   |  
            | 3/9/2018 | -0.30 / -8.11% | 4.00 | 4.00 | 3.40 | 3.40 | 3.84 | 2.32 | 2,406,315 |   |  			
            | 3/8/2018 | +0.30 / +8.82% | 3.70 | 3.70 | 3.70 | 3.70 | 3.70 | 2.52 | 359,900 |   |  
            | 3/7/2018 | +0.30 / +9.68% | 3.40 | 3.40 | 3.30 | 3.40 | 3.39 | 2.32 | 513,500 |   |  			
            | 3/6/2018 | +0.20 / +6.90% | 2.90 | 3.10 | 2.90 | 3.10 | 3.01 | 2.11 | 951,677 |   |  
            | 3/5/2018 | +0.10 / +3.57% | 2.70 | 2.90 | 2.70 | 2.90 | 2.86 | 1.98 | 382,023 |   |  			
            | 3/2/2018 | +0.10 / +3.70% | 2.60 | 2.80 | 2.60 | 2.80 | 2.70 | 1.91 | 522,200 |   |  
            | 3/1/2018 | +0.20 / +8.00% | 2.60 | 2.70 | 2.50 | 2.70 | 2.60 | 1.84 | 228,140 |   |  |