2 gctcggactctatctagcagaaacctcgttcagctagtcttgcttcatggaggtttgatc
3 tagactgcaaacgtcggtgctaaaagaccatacttccgtatgtgcctatcgggagcagtc
4 gctgagaagtgcggaatgatccttcaatgaccgccgttaaagcctgggagtccgcgccac
5 aatcattccatatacagcaacacgcgctacgcggacctctcggtgggtgacgattctatt
6 gaggcgttgaagcgagaaagatattccgattcttttcgagtctatagttaaatcggactg
9 ggccgggatggccggacctgttctgaacatcttatatccacccgaacaagttataaacaa
10 tttaaatctgggcggccatctataagcgtgtcttcagtatgagagtcttcggatatcacg
12 >empty1 an empty seq well-formatted
14 >empty2 an empty seq without subsequent empty line
16 gctgcctctatcaagggtgaaaattgcctgcccggctgggtagacactcgcaccactccc
18 >empty3 empty seq at the end of the file