DACCA, Pakistan, March. 20 —The leader of East Pakistan, Sheik Mujibur Rahman, reported “some progress” today after emerging from his fourth bar gaining, session, with Pakistan's President, Agha Mohammad Yahya Khan; over East Pakistani demands for self‐rule.

It was the first time the Bengali leader has himself said that progress had been made, although his good spirits after yesterday's meeting provided an earlier indication.

Sheik Mujib‐remained secretive, however, about what formulas were being discussed to meet his demands for ending West Pakistan's long political, economic and military domination of East Pakistan. He said he Would meet with the President again on Monday.

The 51‐year‐old leader and the Awami League, his political party, had been demanding regional autonomy for East Pakistan under a program that would link East, and. West only by a weak central government with limited powers restricted to defense and some foreign policy matters.

Added New Demands

But recently, after scores of East Pakistani civilians were killed by West Pakistani troops stationed here, he added new (demands—that all troops with draw to their barracks, that martial law be lifted and that power be transferred to the people's representatives, namely the Awami League, which won a clear majority in the elections last December for National Assembly.

Since these killings, which occurred nearly three weeks ago when the Bengalis demonstrated against the central Government's postponement of the new Assembly's first session, East Pakistan—separated from the western wing by 1,000 miles of Indian territory—has been under the de facto control of Sheik Mujib and his party.

The population, obeying only Sheik Mujib's directives, has defied the martial‐law regime imposed here by the central Government in West Pakistan.

The present speculation by sources close to the talks is that the two sides are talking about some interim arrangement for the transition from military to civilian rule.

One possibility, according to some reports, would be to pass power temporarily to the provincial assemblies that were elected along with the National Assembly in December. These assemblies could operate as the government in the country's five provinces—the four provinces of West Pakistan plus East Pakistan—until the National Assembly adopts a new constitutional structure for the country. The National Assembly now is scheduled to convene Thursday in Dacca.

Because of the East Pakistanis' majority in the assembly, the constitution would presumably grant East Pakistan no less than the full program laid down by Sheik Mujib.

Deep concern has suddenly arisen in the smaller, autonomy minded provinces of West Pakistan—Baluchistan, Sind and the Northwest Frontier Province—over what might happen to them if East Pakistan should succeed in winning a large measure of self‐rule.

The leaders of these provinces fear that the West Pakistani Establishment, the armed forces and the big business interests, angered because they have lost their hold over East Pakistan, will react with ruthless suppression. They think that the fourth and largest province, the Punjab, which is the stronghold of the Establishment, might try to rule the smaller provinces by military force.

As a consequence, all the major political leaders of the smaller provinces have flown hurriedly to Dacca to try to protect their interests.

The political leader of the Punjab, Zulfiqar Ali Bhutto,‐ the head of the Pakistan People's party who refused two days, ago to come to Dacca, also said that he had changed his mind and planned to arrive tomorrow with a group of aides. Mr. Bhutto's party won 85 of the 144 West Pakistani seats, in the election for the National Assembly.