Please be sure to read section  first. The first question in the symbolic meaning, which is the word symbolism, is: Why are there 4 parallel accounts of the last supper in the Gospels and one more in 1 Corinthians11? The answer is that these stand for 5 different Passover celebrations in various churches. We know this from the Parallel account principle of the code. We think the solution is as follows.
Matthew with the meal and one cup and one loaf is the last supper of FDS1
Mark with the meal and one cup and one loaf is the last supper of FDS2 under Bilhah, the ELC
Luke with the meal and the cups and the loaf not associated with either cup is the last supper of FDS2 under Zilphah, the HLC
John with the meal but no cups or loaves mentioned is the last supper of FDS4
1 Corinthians with no meal mentioned and only one cup and one loaf is the last supper of FDS3.