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We explore the moduli space of the two dimensional fermionic string withlinear dilaton. In addition to the known 0A and 0B theories, there are twotheories with chiral GSO projections, which we call IIA and IIB. They aresimilar to the IIA and IIB theories of ten dimensions, but are constructed witha different GSO projection. Compactifying these theories on various twistedcircles leads to eight lines of theories. Three of them, 0A on a circle,super-affine 0A and super-affine 0B are known. The other five lines of theoriesare new. At special points on two of them we find the noncritical superstring.Comment: 19 pages, one figure, minor change

Observations On The Moduli Space Of Two Dimensional String Theory