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Even before the meeting began Monday, South Korean Environment Minister Kim Wan-sup was trying to dial back expectations, telling reporters: “I believe it may be more realistic to pursue stepwise measures.”

But even reaching those valleys can be difficult, requiring the stepwise exchange of electrons and protons among various molecules.

MIF levels also appeared to increase in a stepwise fashion as neighborhood composition changed from mostly Black to some Black to mixed to mostly white neighborhoods.

In general, mutations in multiple genes accumulate in a stepwise manner when normal cells become cancerous.

Then, their descendants make a stepwise return to the north, taking up to four generations to complete the journey.