To me they sound the same, but I am not 100% sure. It's weird. Combining into seems correct, but combining onto seems wrong.

This is from Automated Pattern Analysis in Petroleum Exploration by Ibrahim Palaz, Sailes K. Sengupta:

We give an example of how the combination rules can be used. We consider a system constituted bu a well with wellbore storage and skin in an infinite homogeneous reservoir, described by [up, maximum, down valley]. We search the effect of combining onto this model a sealing fault, described by [up, plateau]. If we combine the response of the sealing fault during the valley, we obtain two alternative descriptions.

This is from Human Evolution – Plagues, Pathogens and Selection by the Royal Society:

It is widely recognised that human genetic disorders of haemoglobin have risen in frequency due to the protection they offer against death from malaria. We propose that the complex geographical distribution of globin mutants can be explained by their specific intracellular interactions. We have shown that cancellation of malaria protection among individuals inheriting both α-thalassaemia and sickle cell trait can explain whyα-thalassaemia fails to reach fixation in sub-Saharan Africa. By combining into this model the observation individuals co-inheriting α- and β-thalassaemia sustain a reduction in blood disorder severity, we can also explain why the highly protective sickle mutant is uncommon in Mediterranean populations which instead harbour a diverse range of thalassaemic haemoglobin disorders. I will discuss some of the implications of this theoretical framework for other regions such as South-East Asia, and also what it can tell us about the mechanisms of malaria protection.

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