Table 2.

Rules for strict filtering procedure

No.	Rule	Examples
1	SpecialSymbolsRule True, if a token contains at least one of the special symbols different from: . -,/: () [] + = @ ®	SIZE(**), SELECTIVITY%, NIMG_650, H2S↔35SCAT, 1AUDAE_AM, ΔGADS, H0 ≦−8.2
2	StopListRule True, if a token is in the stop list (Table 1)	LITERATURE, VIEWPOINT, PERCENT, PRESENT, IMPORTANCE, FUNDAMENTAL, CONCLUSION, TYPICALLY, EXAMPLE, INTRODUCTION
Rules of regular expressions: True, if a token satisfies at least one of the regular expressions from the following list
3	4DigitRule True, if a token contains four or more digits in succession	FQM-3994, RYC-2008-03387, 20000H-1, MAT2010-21147, CO(0001)-CARBIDE, CO(111)/CO(0001), RU(0001) ELECTRODE
4	3DigitRule True, if a token contains three digits in succession	215KMTA, 220ML, 148H-1, CU2O(111), AU{111}-CEO2{100}, MGO/AG(100)
	2DigitRule True, if a token begins with one or two digits	12C16O-13C16O, 31P{1H}, 2-PROPANOL, 2-METHYL-1-BUTENE, 3-METHYL-1,3-BUTADIENE, 15 %H3PW12O40/TIO2
5	UnitsRule True, if a token ends with a string from the dictionary of measurement units (Table 1)	KJMOL-1, MMOL.MIN-1, KJ.MOL-1, G.GZEOLITE-1.H-1, CM3.MIN-1.G-1