Thread:Lampville/@comment-5039776-20120904103459/@comment-5261757-20121001201307

Holy Magic Rock! Thank you very much for all the work into shedding light on this awful plague which is hanging above us like some pre-historic disaster.

Let this be a lesson to us all - when working out a problem on 2 abacus(es?), if you lose track with one, don't copy the value in the other one and continue.