pdftk `
 F="ENSC3016_PS_T4_b_DC Machines_Solution[50d7a8].pdf" `
 E="ENSC3016_PS_T4_a_DC Machines_Solution[3a221a].pdf" `
 D="ENSC3016_T7_PS_Synchronous_Machines_Part3_Solutions[71c8f8].pdf" `
 C="ENSC3016_T8_PS_Induction_Machines_Part2_Solutions(2)[7cca6e].pdf" `
 B="ENSC3016_Induction_Machines_Solutions[74fb7b].pdf" `
 A="ENSC3016_PS_T6_c_Transformers_Solution[b4ede2].pdf" `
 cat A2 A3 D3-5 C6 B3-6 E F `
 output print.pdf verbose