Warranty period difference between Samsung and Dell is 4 months less than the warranty period difference between __and ___?

We have, At least two LAPTOP brands are kept above HP which is kept above the one which has a warranty period of 20 months but not immediately above. HP brand LAPTOP is kept above the 3rd shelf. Asus has 21 month warranty period. The bulb which has 14 month warranty period is kept immediately below Dell which is placed at an even number shelf. Here we have four possibilities. Again we have, Apple has either 12 or 24 months warranty period and is kept immediately below Acer. Acer kept 2nd to the above of one which warranty period is an even value. Case-I, case- III and case-IV gets eliminated because no space left for Apple and Acer. Again we have, The warranty period difference between Samsung and Lenovo is four months. The difference between Acer and Lenovo’s warranty period is equal as the number of LAPTOP brands kept below Apple.