Table 1. Dictionary of symbols and acronyms used in the description of the classification.

ξ	–	match score, similarity between query read and the set of the reference sequences
Ξ	–	match rate score, percentage ratio of the match score to the read length
D i	–	k-mer database for an i-th group
f	–	number of various groups to which the reads were classified
F	–	output files after assignment to the best group
FP	–	number of incorrectly classified reads
G 0	–	set of all reference sequences
$G_i^j$	–	set of reference sequences for the i-th group at the j-th level
k	–	subsequence (k-mer) length
M	–	dataset of reads
MC	–	match cut-off value of sequence identity
n j	–	number of various sets (groups) of reference sequences, with whom the query read is compared at the j-th taxonomic rank
NC	–	number of reads not classified to any group
R	–	query read
S	–	reference sequence
TP	–	number of correctly classified reads