Preparation for psalm 119 - rare and frequent key words

I have not yet verified all these data points - but I think they are pretty close. These are the psalms that themselves use in a repeated fashion the key words of psalm 119 (variations on the gifts of each of the teaching synonyms) .

There is a significant division: 4 of the words are used frequently, 4 of them are rare. The grey columns are frequent, the pink ones rare. All are used at least once in a recurrence pattern before the great recurrence meditation of psalm 119. (But this would not be the case if I confined my search to nouns - e.g. צוה is used as a verb in psalm 78, the repetition of פקד in Psalm 109 is a homonym - so פִּקּוּדִים is rare and has no preparation in a prior psalm, חק showed up in psalm 89 but was a false positive. In 105 it is accurately equivalent to the use of the word in Psalm 119).

Considering the importance of mitzvot and Torah in modern Hebrew, I am surprised at this result.

תורה	אמר	שׁפט	עד	דבר	צוה	חק	פקד	PSALM
2								1
	2							4
		3						7
		6	2					9
	3	2						10
	4			3				12
			4					13
				2				17
	2		2	3				18
	3							19
			2					21
			2					22
				2				28
				2				29
	2							31
				2				33
	6	2		2				35
		4						37
			2					38
								39
	4							40
	2			3				41
	2							42
			2	2				45
			2					48
			2					49
	2			4				50
				2				52
	2							54
				2				55
				4				56
			3					57
		2		2				58
								59
			2					60
				2				63
				2				64
				2				65
	2							68
	2							70
	2		4					71
		3	3					72
	2			2				73
			3					74
		2		2				75
	2							77
3	2			6	2			78
			3					80
		4						82
	2							83
				2				85
	2	2	4					89
			3					90
				2				91
	2	2	4					94
		2						96
		2						97
		2						98
		2						99
				2				101
				2				103
								104
	4	2		5		2		105
	3		3	5				106
	3			4				107
			2					108
		2		3			2	109
			3					111
			3					112
			2					113
	3							118
25	21	23	23	26	22	21	21	119
								121
								127
	2							129
								130
			3					132
	2							138
								141
				2				144
	2		3	3				145
								146
		2		3				147