text is aligned with the long side of the greeting and the greeting opens up or down
most common, text is aligned with the short side of the greeting and the greeting opens to the left or right
most common, greeting opens at the side or top
greeting opening is in the center of the front, half folds up or left and half folds down or right; example shown here is the Amanda Invitation opened
like a matchbook, three-fourths open up or left and one-fourth opens down or right; sometimes the smaller flap is fastened so that only the larger flap opens