What filename do you want to read? run1.txt
Read: append a 2
Supervector a: [2] size=1 cap=3
Supervector b: [] size=0 cap=3

Read: append b 4
Supervector a: [2] size=1 cap=3
Supervector b: [4] size=1 cap=3

Read: append a 6
Supervector a: [2 6] size=2 cap=3
Supervector b: [4] size=1 cap=3

Read: append a 8
Supervector a: [2 6 8] size=3 cap=3
Supervector b: [4] size=1 cap=3

Read: append b 10
Supervector a: [2 6 8] size=3 cap=3
Supervector b: [4 10] size=2 cap=3