Preheat oven to 350 degrees F (175 degrees C). Grease and flour one 9×5 inch pan.
Cream margarine and sugar until smooth. Beat in eggs, then bananas. Add flour and soda, stirring just until combined.
Pour into prepared pan and bake at 350 degrees F (175 degrees C) for about 1 hour (or till toothpick comes out clean).Remove from pan and let cool, store in refrigerator or freeze.
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