$5.$ Use the split and csplit commands to perform the tasks described below. You must complete these tasks in the order specified.

a$.$ Split the dna$2.$fasta file into multiple subfiles, each containing the same number of three lines. Additionally, the names of the newly created subfiles must start with the prefix split$\_.$

b$.$ Use cat to observe the content in the file dna$2.$fasta and the newly created subfiles. Explain your observations.

c$.$ Based on your observations, split the file dna$2.$fasta file into multiple subfiles with the observed number of lines for each sequence. Again, the names of the newly created subfiles must start with the prefix split$\_.$