LED dilema

Using Arduino Project Guidance
11

yes, 2 pin only could drive 2 led with charliplexing. Anyway you could control 4 led with 2 pin with multiplexing,
A B LED1 LED2 LED3 LED4
0 0 0 0 0 1
0 1 0 0 1 0
1 0 0 1 0 0
1 1 1 0 0 0