The files contain strength-2 covering arrays classified in the study "J. I. Kokkala, K. Meagher, R. Naserasr, K. J. Nurmela, P. R. J. Östergård, B. Stevens, On the Structure of Small Strength-2 Covering Arrays". Each line in a file corresponds to a \(\mathrm{CA}(N;2,k,v)\), rows of the covering array are separated by space. The file name format is ca_N_2_k_v.txt if all covering arrays were classified. Whenever only uniform covering arrays are classified, the file name is uca_N_2_k_v.txt. An additional suffix _delta_δ in the file name implies that only covering arrays with that \(\delta\) parameter (see the publication) were classified. In some cases, the number of inequivalent covering arrays was too large for the arrays to be stored; those cases are omitted here.

Supported by the Aalto ELEC Doctoral School, Nokia Foundation, Academy of Finland Project #289002, and an NSERC discovery grant.