Continuous problem with subcloning with restrictionenzymes NheI-HF and SphI-HF and ligatio?

Hello, I been in cloning hell for 3 months now and I need some fresh ideas how to fix this. So I have two plasmids, CAR_T (7,2 kb) and Shx_b (3,1 kb) that boths contains a NheI and SphI sites...

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