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<br />_ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ - _
<br />EXHIBIT 4 Page 6^
<br />$22,000,000
<br />CERTIFICATES OF PARTICIPATION
<br />MA ION COUNTY, OREGON JECT) 1998 SERIES A
<br />PROOF OF INVESTMENT YIELD
<br />INVESTMENT YIELD : 4.829880381~
<br />PERIOD PRESENT PRESENT
<br />ENDING INVESTMENTS VALUE FACTOR VALUE
<br />10/08/99 -0.00 1.058380091 -0.00
<br />10/15/99 1.057398388
<br />10/20/99 1.056697729
<br />10/25/99 1.055997534
<br />10/31/99 1.055297804
<br />11/02/99 -330,489.01 1.055018041 -348,671.87
<br />11/OS/99 1.054598537
<br />11/30/99 1.051109146
<br />12/09/99 1.049855794
<br />12/29/99 1.047075914
<br />12/30/99 1.046937114
<br />12/31/99 1.046937114
<br />O1/15/00 1.044857312
<br />O1/20/00 -631,947.16 1.044164963 -659,857.08
<br />O1/25/00 1.043473073
<br />O1/31/00 1.042781641
<br />02/15/00 1.040710094
<br />02/18/00 -1,428,031.23 1.040296279 -1,485,575.57
<br />02/22/00 1.039744781
<br />02/26/00 1.038918082
<br />02/29/00 -1,276.46 1.038780363 -1,325.96
<br />03/07/00 1.037679267
<br />03/15/00 -568.08 1.036579337 -588.86
<br />03/16/00 1.036441928
<br />03/20/00 1.035892474
<br />03/24/00 1.035343310
<br />04/04/00 1.033971676
<br />04/14/00 -0.00 1.032601858 -0.00
<br />04/15/00 1.032464976
<br />04/17/00 -1,027,500.00 1.032191267 -1,060,576.53
<br />04/28/00 1.030687162
<br />04/30/00
<br />OS/O1/00
<br />-1,028,125.00 1.030413924
<br />1.030277332
<br />-1,059,253.68
<br />OS/02/00
<br />OS/04/00
<br />-0.02 1.030140758
<br />1.029867665
<br />-0.02
<br />OS/OB/00 1.029321696
<br />OS/19/00 1.027821772
<br />OS/26/00 1.026868414
<br />OS/31/00 1.026324034
<br />06/09/00 1.025100236
<br />06/16/00 1.024149402
<br />06/20/00 -2,341,105.41 1.023606464 -2,396,370.63
<br />06/27/00 1.022657015
<br />06/30/00 -0.20 1.022250379 -0.20
<br />07/07/00 1.021302188
<br />07/21/00 1.019408444
<br />07/31/00 1.018192892
<br />08/04/00
<br />08/18/00
<br />-50,033.33 1.017653112
<br />1.015766134
<br />-50,822.16
<br />OB/31/00 1.014151510
<br />09/14/00
<br />09/29/00
<br />-0.11 1.012271025
<br />1.010260089
<br />-0.11
<br />10/10/00 1.008787942
<br />10/20/00 1.007451488
<br />10/31/00 1.006116805
<br />11/14/00 1.004251218
<br />
<br />12/12%00 1.000530417
<br /> PRESENT
<br />PROCEEDS VALUE FACTOR PRESENT VALUE
<br /> 1.058380091
<br />0.00 1.057398388 0.00
<br /> 1.056697729
<br /> 1.055997534
<br />1,056,250.00 1.055297804 1,114,658.31
<br /> 1.055018041
<br />246.67 1.054598537 260.14
<br />507,633.33 1.051109146 533,578.04
<br />973,484.92 1.049855794 1,022,018.78
<br />15,869.05 1.047075914 16,616.10
<br />1,021,830.85 1.046937114 1,069,792.64
<br />26,675.00 1.046937114 28,136.43
<br />604,678.75 1.044857312 631,803.01
<br /> 1.044164963
<br />692,138.79 1.043473073 722,228.19
<br />26,875.00 1.042781641 28,024.76
<br />1,390,696.10 1.040710094 1,447,311.47
<br /> 1.040296279
<br />1,428,872.18 1.039744781 1,485,662.39
<br />435.51 1.038918082 452.46
<br /> 1.038780363
<br />568.08 1.037679267 589.48
<br /> 1.036579337
<br /> 1.036441928
<br /> 1.035892474
<br />1,058,295.75 1.035343310 1,095,699.43
<br /> 1.033971676
<br /> 1.032601858
<br />1,027,500.00 1.032464976 1,060,857.76
<br /> 1.032191267
<br /> 1.030687162
<br />1,028,125.00 1.030413924 1,059,394.32
<br /> 1.030277332
<br /> 1.030140758
<br /> 1.029867665
<br />1,245,458.90 1.029321696 1,281,977.87
<br />507,860.00 1.027821772 522,010.12
<br />960,659.12 1.026868414 966,470.51
<br /> 1.026324034
<br /> 1.025100236
<br />2,341,105.41 1.024149402 2,397,641.71
<br /> 1.023606464
<br /> 1.022657015
<br /> 1.022250379
<br />1,131,699.24 1.021302188 1,155,806.91
<br />52,571.26 1.019408444 53,591.59
<br />799,540.20 1.018192892 814,086.15
<br />33.33 1.017653112 33.92
<br /> 1.015766134
<br /> 1.014151510
<br />0.11 1.012271025 0.11
<br /> 1.010260089
<br /> 1.008787942
<br /> 1.007451488
<br /> 1.006116805
<br /> 1.004251218
<br /> 1.002389091
<br />2.532.939.98 1.000530417 2,534,283.49
<br />ARBITRAGE COMPLIANCE SPECIALISTS, INC.
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