He could run each sequence backwards and forwards, take it from the top, add, subtract.

ECONOMIST: Christopher Logue, poet, died on December 2nd, aged 85

During the Annefrank flyby, Stardust will run through the exact sequence planned for the comet encounter, with science instruments all running and relaying data at high speeds for the first time since the space probe's launch.

BBC: Probe set for asteroid flyby