Magic Integer 1345 in PCRA.py

[laxatives]

From PTransE/PCRA.py:

for line in f:
    seg = line.strip().split()
    relation2id[seg[0]] = int(seg[1])
    id2relation[int(seg[1])]=seg[0]
    id2relation[int(seg[1])+1345]="~"+seg[0]
    relation_num+=1
f.close()

What does 1345 in line 26 represent? Is this adding a negative label to the end of the list? Is 1345 some default number of ids?

[laxatives]

$ wc -l relation2id.txt
    1345 relation2id.txt