sh_ and ch_ compose the same words

[farmerjohn]

To understand which correlation values are typical here are some more samples:

First, Torsten's pairs, just for test.
Corr(chedy[515], shedy[438]): 0.84
Corr(chey[350], shey[285]): 0.68
Corr(chol[405], shol[191]): 0.41
Corr(cheey[173], sheey[148]): 0.39
Corr(cho[68], sho[126]): 0.36
Corr(cheol[169], sheol[112]): 0.43
Corr(chy[154], shy[104]): 0.27
Corr(chor[213], shor[97]): 0.23
Corr(cheedy[57], sheedy[85]): 0.60

Then words which frequently appear adjacent:
Corr(or[367], aiin[464]): 0.50
Corr(ar[370], aiin[464]): 0.67
Corr(chol[405], daiin[892]): 0.18
Corr(ol[550], aiin[464]): 0.27
Corr(ol[550], chedy[515]): 0.58
Corr(daiin[892], aiin[464]): 0.20

ch <-> qok:
Corr(chedy[515], qokedy[269]): 0.73
Corr(chey[350], qokey[107]): 0.56
Corr(chol[405], qokol[97]): 0.07
Corr(cheey[173], qokeey[305]): 0.44
Corr(cho[68], qoko[6]): -0.03
Corr(cheol[169], qokeol[51]): 0.43

sh <-> qok:
Corr(shedy[438], qokedy[269]): 0.72
Corr(shey[285], qokey[107]): 0.63
Corr(shol[191], qokol[97]): 0.04
Corr(sheey[148], qokeey[305]): 0.53
Corr(sho[126], qoko[6]): 0.02
Corr(sheol[112], qokeol[51]): 0.27

sh <-> qot:
Corr(shedy[438], qotedy[92]): 0.61
Corr(shey[285], qotey[25]): 0.47
Corr(shol[191], qotol[45]): -0.07
Corr(sheey[148], qoteey[41]): 0.30
Corr(sho[126], qoto[3]): 0.05
Corr(sheol[112], qoteol[12]): 0.13

ok <-> qok:
Corr(okedy[119], qokedy[269]): 0.65
Corr(okey[65], qokey[107]): 0.49
Corr(okal[148], qokal[198]): 0.30
Corr(okeey[173], qokeey[305]): 0.78
Corr(oko[8], qoko[6]): -0.03
Corr(okeol[62], qokeol[51]): 0.34
Corr(okain[117], qokain[219]): 0.68
Corr(okaiin[216], qokaiin[266]): 0.66

Some random pairs with high correlation coefficient:
Corr(ol[550], qol[158]): 0.74
Corr(qokeedy[305], qokeey[305]): 0.71
Corr(al[273], ar[370]): 0.77
Corr(lchedy[118], qokeedy[305]): 0.70
Corr(checthy[28], shecthy[19]): 0.81
Corr(okain[117], otain[74]): 0.70
Corr(qokey[107], shedy[438]): 0.71
Corr(oteedy[96], qokeey[305]): 0.72