at identifies a particular episode.
For example, given the following case fragment,
01 Jun 03 15 Oct 03 02 Nov 03 21 Dec 03 ABC 2.5 3.2 2.9 2.7 DEF 6.3 1.9 3.4 2.6 JKL red orange yellow
ABC at JKL is “yellow” is 2.9
DEF at max ABC < 2
at identifies a particular episode.
For example, given the following case fragment,
01 Jun 03 15 Oct 03 02 Nov 03 21 Dec 03 ABC 2.5 3.2 2.9 2.7 DEF 6.3 1.9 3.4 2.6 JKL red orange yellow
ABC at JKL is “yellow” is 2.9
DEF at max ABC < 2